How to mount my USB-C pen drive in Android 12

I am running Android 12 on a Realme 8 5G phone. I've tried inserting a USB-C pen drive into the USB-C port I usually use to charge my phone. According to some websites, I should get a notification showing me that the pen drive has been mounted. However, this is not happening. In fact, the phone does not even make a beep when I insert the USB-C pen drive. I don't even know whether the media on the pen drive is formatted, and in particular whether it is formatted for use with Android. I bought the pen drive for use with my phone. I would like to back up some internal storage or Google Drive files to the pen drive. Here is some Termux output.

$ mount

/dev/block/dm-15 on / type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
tmpfs on /dev type tmpfs (rw,seclabel,nosuid,relatime,size=2859064k,nr_inodes=714766,mode=755)
devpts on /dev/pts type devpts (rw,seclabel,relatime,mode=600,ptmxmode=000)
none on /dev/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
none on /dev/cpuctl type cgroup (rw,nosuid,nodev,noexec,relatime,cpu)
none on /dev/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset,noprefix,release_agent=/sbin/cpuset_release_agent)
none on /dev/memcg type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
none on /dev/stune type cgroup (rw,nosuid,nodev,noexec,relatime,schedtune)
binder on /dev/binderfs type binder (rw,relatime,max=1048576,stats=global)
adb on /dev/usb-ffs/adb type functionfs (rw,relatime)
mtp on /dev/usb-ffs/mtp type functionfs (rw,relatime)
ptp on /dev/usb-ffs/ptp type functionfs (rw,relatime)
none on /dev/freezer type cgroup (rw,relatime,freezer)
proc on /proc type proc (rw,relatime,gid=3009,hidepid=2)
sysfs on /sys type sysfs (rw,seclabel,relatime)
selinuxfs on /sys/fs/selinux type selinuxfs (rw,relatime)
none on /sys/fs/cgroup type cgroup2 (rw,nosuid,nodev,noexec,relatime)
tracefs on /sys/kernel/tracing type tracefs (rw,seclabel,relatime)
none on /sys/fs/fuse/connections type fusectl (rw,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime)
pstore on /sys/fs/pstore type pstore (rw,seclabel,nosuid,nodev,noexec,relatime)
tmpfs on /mnt type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755,gid=1000)
/dev/block/dm-4 on /mnt/vendor/my_product type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-5 on /mnt/vendor/my_engineering type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-8 on /mnt/vendor/my_company type ext4 (ro,seclabel,relatime)
/dev/block/dm-9 on /mnt/vendor/my_carrier type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-10 on /mnt/vendor/my_region type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-7 on /mnt/vendor/my_heytap type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-6 on /mnt/vendor/my_stock type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-11 on /mnt/vendor/my_preload type ext4 (ro,seclabel,relatime)
/dev/block/dm-14 on /mnt/vendor/my_bigball type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-12 on /mnt/vendor/my_manifest type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/by-name/oplusreserve2 on /mnt/vendor/oplusreserve type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
/dev/block/by-name/oplusreserve2 on /mnt/oplus/op2 type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
tmpfs on /mnt/installer type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755,gid=1000)
/dev/fuse on /mnt/installer/0/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/data/media on /mnt/installer/0/emulated/0/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/installer/0/emulated/0/Android/obb type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/installer/0/emulated/999/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/dev/fuse on /mnt/installer/999/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/data/media on /mnt/installer/999/emulated/999/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/installer/999/emulated/999/Android/obb type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
tmpfs on /mnt/androidwritable type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755,gid=1000)
/dev/fuse on /mnt/androidwritable/0/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/data/media on /mnt/androidwritable/0/emulated/0/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/androidwritable/0/emulated/0/Android/obb type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/androidwritable/0/emulated/999/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/dev/fuse on /mnt/androidwritable/999/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/data/media on /mnt/androidwritable/999/emulated/999/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/androidwritable/999/emulated/999/Android/obb type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/dev/block/by-name/protect1 on /mnt/vendor/protect_f type ext4 (rw,seclabel,nosuid,nodev,noatime,nodelalloc,noauto_da_alloc,commit=1,data=ordered)
/dev/block/by-name/protect2 on /mnt/vendor/protect_s type ext4 (rw,seclabel,nosuid,nodev,noatime,nodelalloc,noauto_da_alloc,commit=1,data=ordered)
/dev/block/by-name/nvdata on /mnt/vendor/nvdata type ext4 (rw,seclabel,nosuid,nodev,noatime,nodelalloc,noauto_da_alloc,commit=1,data=ordered)
/dev/block/by-name/nvcfg on /mnt/vendor/nvcfg type ext4 (rw,seclabel,nosuid,nodev,noatime,nodelalloc,noauto_da_alloc,commit=1,data=ordered)
/dev/block/by-name/persist on /mnt/vendor/persist type ext4 (rw,seclabel,nosuid,nodev,noatime,nodelalloc,noauto_da_alloc,commit=1,data=ordered)
/data/media on /mnt/runtime/default/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/runtime/read/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=23,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/runtime/write/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/runtime/full/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
/dev/fuse on /mnt/user/0/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/data/media on /mnt/user/0/emulated/0/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/user/0/emulated/0/Android/obb type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/user/0/emulated/999/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/pass_through/0/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
/dev/fuse on /mnt/user/999/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/data/media on /mnt/user/999/emulated/999/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/user/999/emulated/999/Android/obb type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /mnt/pass_through/999/emulated type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=9997,multiuser,mask=7,derive_gid,default_normal,unshared_obb)
/dev/block/by-name/metadata on /metadata type ext4 (rw,seclabel,nosuid,nodev,noatime,discard,data=ordered)
/dev/block/dm-16 on /vendor type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-17 on /product type ext4 (ro,seclabel,relatime)
overlay-overlay on /product/app type overlay (ro,seclabel,noatime,lowerdir=/mnt/vendor/my_region/app:/mnt/vendor/my_product/app:/mnt/vendor/my_heytap/app:/mnt/vendor/my_stock/app:/mnt/vendor/my_engineering/app:/product/app,override_creds=off)
overlay-overlay on /product/priv-app type overlay (ro,seclabel,noatime,lowerdir=/mnt/vendor/my_region/priv-app:/mnt/vendor/my_product/priv-app:/mnt/vendor/my_heytap/priv-app:/mnt/vendor/my_stock/priv-app:/mnt/vendor/my_engineering/priv-app:/product/priv-app,override_creds=off)
overlay-overlay on /product/lib64 type overlay (ro,seclabel,noatime,lowerdir=/mnt/vendor/my_region/lib64:/mnt/vendor/my_product/lib64:/mnt/vendor/my_heytap/lib64:/mnt/vendor/my_stock/lib64:/product/lib64,override_creds=off)
overlay-overlay on /product/lib type overlay (ro,seclabel,noatime,lowerdir=/mnt/vendor/my_region/lib:/mnt/vendor/my_product/lib:/mnt/vendor/my_heytap/lib:/mnt/vendor/my_stock/lib:/product/lib,override_creds=off)
overlay-overlay on /product/overlay type overlay (ro,seclabel,noatime,lowerdir=/mnt/vendor/my_region/overlay:/mnt/vendor/my_product/overlay:/mnt/vendor/my_heytap/overlay:/mnt/vendor/my_stock/overlay:/mnt/vendor/my_engineering/overlay:/product/overlay,override_creds=off)
overlay on /product/etc/permissions type overlay (ro,seclabel,relatime,lowerdir=/mnt/vendor/my_product/product_overlay/etc/permissions/:/product/etc/permissions/,override_creds=off)
overlay on /product/framework type overlay (ro,seclabel,relatime,lowerdir=/mnt/vendor/my_product/product_overlay/framework/:/product/framework/,override_creds=off)
/dev/block/dm-18 on /system_ext type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-3 on /odm type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
tmpfs on /apex type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755)
/dev/block/loop4 on /apex/com.android.appsearch@300000000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop4 on /apex/com.android.appsearch type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop5 on /apex/com.android.apex.cts.shim@1 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop5 on /apex/com.android.apex.cts.shim type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop6 on /apex/com.android.i18n@1 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop6 on /apex/com.android.i18n type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop7 on /apex/com.android.wifi@319999900 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop7 on /apex/com.android.wifi type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-22 on /apex/com.android.extservices@341131030 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-22 on /apex/com.android.extservices type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop10 on /apex/com.android.vndk.v31@1 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop10 on /apex/com.android.vndk.v31 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-23 on /apex/com.android.art@341110062 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-23 on /apex/com.android.art type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-24 on /apex/com.android.permission@341110010 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-24 on /apex/com.android.permission type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-25 on /apex/com.android.conscrypt@341110002 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-25 on /apex/com.android.conscrypt type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-26 on /apex/com.android.tzdata@313110000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-26 on /apex/com.android.tzdata type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop14 on /apex/com.android.runtime@1 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop14 on /apex/com.android.runtime type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop15 on /apex/com.android.vndk.v30@1 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop15 on /apex/com.android.vndk.v30 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-27 on /apex/com.android.scheduling@340819220 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-27 on /apex/com.android.scheduling type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-28 on /apex/com.android.os.statsd@341114000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-28 on /apex/com.android.os.statsd type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-29 on /apex/com.android.media@341111002 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-29 on /apex/com.android.media type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-30 on /apex/com.android.mediaprovider@341111020 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-30 on /apex/com.android.mediaprovider type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-31 on /apex/com.android.adbd@340912202 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-31 on /apex/com.android.adbd type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-32 on /apex/com.android.media.swcodec@341111002 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-32 on /apex/com.android.media.swcodec type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-33 on /apex/com.android.neuralnetworks@341010000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-33 on /apex/com.android.neuralnetworks type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-34 on /apex/com.android.cellbroadcast@341110000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-34 on /apex/com.android.cellbroadcast type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-35 on /apex/com.android.ipsec@340914200 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-35 on /apex/com.android.ipsec type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-36 on /apex/com.android.tethering@341112070 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-36 on /apex/com.android.tethering type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/loop26 on /apex/com.google.mainline.primary.libs@311820000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-37 on /apex/com.google.mainline.primary.libs@341177000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-38 on /apex/com.android.resolv@341110000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-38 on /apex/com.android.resolv type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-39 on /apex/com.android.sdkext@341110000 type ext4 (ro,dirsync,seclabel,nodev,noatime)
/dev/block/dm-39 on /apex/com.android.sdkext type ext4 (ro,dirsync,seclabel,nodev,noatime)
tmpfs on /apex/apex-info-list.xml type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755)
tmpfs on /linkerconfig type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755)
tmpfs on /linkerconfig type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755)
none on /config type configfs (rw,nosuid,nodev,noexec,relatime)
/dev/block/dm-4 on /my_product type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-5 on /my_engineering type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-8 on /my_company type ext4 (ro,seclabel,relatime)
/dev/block/dm-9 on /my_carrier type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-10 on /my_region type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-7 on /my_heytap type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-6 on /my_stock type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-11 on /my_preload type ext4 (ro,seclabel,relatime)
/dev/block/dm-14 on /my_bigball type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/dm-12 on /my_manifest type erofs (ro,seclabel,relatime,user_xattr,acl,cache_strategy=readaround)
/dev/block/by-name/cache on /cache type ext4 (rw,seclabel,nosuid,nodev,noatime,discard,noauto_da_alloc,data=ordered)
/dev/block/dm-21 on /data type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,reserve_root=55436,resuid=0,resgid=1065,inlinecrypt,alloc_mode=default,fsync_mode=nobarrier)
/dev/block/dm-21 on /data/user/0 type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,reserve_root=55436,resuid=0,resgid=1065,inlinecrypt,alloc_mode=default,fsync_mode=nobarrier)
/dev/block/by-name/oplusreserve2 on /data/persist_log/oplusreserve/media/log/shutdown type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
/dev/block/by-name/oplusreserve2 on /data/persist_log/oplusreserve/media/log/hang_oplus type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
/dev/block/by-name/oplusreserve2 on /data/persist_log/cache/factory type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
/dev/block/by-name/oplusreserve2 on /data/persist_log/criticallog type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
/dev/block/by-name/oplusreserve2 on /data/persist_log/oplusreserve/media/log/minidumpbackup type ext4 (rw,seclabel,nosuid,nodev,noatime,data=ordered)
/data/incremental/MT_data_app_vmdl181/backing_store on /data/incremental/MT_data_app_vmdl181/mount type incremental-fs (rw,seclabel,nosuid,nodev,noatime,read_timeout_ms=10000,readahead=0)
/data/incremental/MT_data_app_vmdl181/backing_store on /data/app/~~Es7HI3jynEtlItXob1h4sw== type incremental-fs (rw,seclabel,nosuid,nodev,noatime,read_timeout_ms=10000,readahead=0)
tmpfs on /data_mirror type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=700,gid=1000)
/dev/block/dm-21 on /data_mirror/data_ce/null type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,reserve_root=55436,resuid=0,resgid=1065,inlinecrypt,alloc_mode=default,fsync_mode=nobarrier)
/dev/block/dm-21 on /data_mirror/data_ce/null/0 type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,reserve_root=55436,resuid=0,resgid=1065,inlinecrypt,alloc_mode=default,fsync_mode=nobarrier)
/dev/block/dm-21 on /data_mirror/data_de/null type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,reserve_root=55436,resuid=0,resgid=1065,inlinecrypt,alloc_mode=default,fsync_mode=nobarrier)
/dev/block/dm-21 on /data_mirror/cur_profiles type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,reserve_root=55436,resuid=0,resgid=1065,inlinecrypt,alloc_mode=default,fsync_mode=nobarrier)
/dev/block/dm-21 on /data_mirror/ref_profiles type f2fs (rw,lazytime,seclabel,nosuid,nodev,noatime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,extent_cache,mode=adaptive,active_logs=6,reserve_root=55436,resuid=0,resgid=1065,inlinecrypt,alloc_mode=default,fsync_mode=nobarrier)
tmpfs on /storage type tmpfs (rw,seclabel,nosuid,nodev,noexec,relatime,size=2859064k,nr_inodes=714766,mode=755,gid=1000)
/dev/fuse on /storage/emulated type fuse (rw,lazytime,nosuid,nodev,noexec,noatime,user_id=0,group_id=0,allow_other)
/data/media on /storage/emulated/0/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /storage/emulated/0/Android/obb type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)
/data/media on /storage/emulated/999/Android/data type sdcardfs (rw,nosuid,nodev,noexec,noatime,fsuid=1023,fsgid=1023,gid=1015,multiuser,mask=6,derive_gid,default_normal,unshared_obb)

$ mount|grep usb
adb on /dev/usb-ffs/adb type functionfs (rw,relatime)
mtp on /dev/usb-ffs/mtp type functionfs (rw,relatime)
ptp on /dev/usb-ffs/ptp type functionfs (rw,relatime)

Alternatively, how can I format or copy files to my USB pen drive from Android? Thanks. My pen drive is not showing in file manager: EDIT: I have searched for OTG (on-the-go) settings in the settings, and have enabled it, as shown below (not sure if this is the USB OTG or something else, can someone please help me, thanks). However, even after snacking this option I cannot see my pen drive in the stock Files app that came with my phone.