how may I find the filesystem image of the OS with initramfs

I want to install Tails on my Hard Drive alongside Kali Linux. So I installed Kali on the system and prepared Grub2. I also created a partition of 3GB for my Tails installation, formatted it to FAT32, named it Tails and dded the tails archive onto it. Now I went to my grub.cfg and put in the lines from the Tails grub.cfg file. Additionally I created a partition with the name "TailsData" of additional 3GB. Now, if I go to my bootloader, I may select Kali as well as Tails. Booting into Kali works fine, but now if I try to boot into Tails it rejects me with initramfs telling me

unable to find a medium containing the live file system

Now for the sake of helping out I inserted in grub.cfg the UUID of the partition as a fix - as it may never ever change... Still I do not get into the system, since I googled this issue I found lots and lots of initramfs errors like mine but none of them seems to fit my case unfortunately... Additional Data: This is my live64.cfg which is loaded to extend syslinux.cfg

include menu.cfg

label live
	menu label Tails 5.19.1
	kernel /live/vmlinuz
	append initrd=/live/initrd.img boot=live ignore_uuid config live-media=removable nopersistence noprompt timezone=Etc/UTC splash noautologin module=Tails slab_nomerge slub_debug=FZ mce=0 vsyscall=none init_on_free=1 mds=full,nosmt page_alloc.shuffle=1 randomize_kstack_offset=on  quiet
	sysappend 0x40000

label livefailsafe
	menu label Tails (Troubleshooting Mode)
	kernel /live/vmlinuz
	append initrd=/live/initrd.img boot=live ignore_uuid config live-media=removable nopersistence noprompt timezone=Etc/UTC splash noautologin module=Tails slab_nomerge slub_debug=FZ mce=0 vsyscall=none init_on_free=1 mds=full,nosmt page_alloc.shuffle=1 randomize_kstack_offset=on  noapic noapm nodma nomce nolapic nosmp
	sysappend 0x40000

#label floppy
#	localboot 0x00

#label disk1
#	localboot 0x80

#label disk2
#	localboot 0x81

#label nextboot
#	localboot -1

Here I added

- but it doesn't change my outcome... Here is my grub.cfg

set root='(hd1,4)'
	search --no-floppy --fs-uuid --set=root ***UUID-XYZ***
	echo "Loading the Linux kernel..."
	linux /live/vmlinuz initrd=/live/initrd.img boot=live config live-media=removable nopersistence noprompt timezone=Etc/UTC splash noautologin module=Tails slab_nomerge slub_debug=FZ mce=0 vsyscall=none init_on_free=1 mds=full,nosmt page_alloc.shuffle=1 randomize_kstack_offset=on FSUUID=***UUID-XYZ*** quiet
	echo "Loading the initramfs..."
	initrd /live/initrd.img
	echo "Booting..."
	boot

If more information is needed, please ask. Note: For now I managed to run the ISO file through Grub... But the ISO may not access the "tailsData" partition for now.