Can't create included directory

I'd like to create a new directory that looks like /dir1/dir2/dir3/dir4 but I can't. If I create the directories one by one from the parent and new parent directories, everything works:

lm@debian:~$ sudo mkdir -v ./Pictures/Photos1/onbike2023/
mkdir: cannot create directory ‘./Pictures/Photos1/onbike2023/’: No such file or directory
lm@debian:~$ sudo mkdir -v ./Pictures/Photos1/
mkdir: created directory './Pictures/Photos1/'
lm@debian:~$ sudo mkdir -v ./Pictures/Photos1/onbike2023/
mkdir: created directory './Pictures/Photos1/onbike2023/'
lm@debian:~$

What am I doing wrong?