Change date modified

I’m attempting to change a date modified on a file using a-shell on iOS. I’m using the command
touch -m “ccyymmddhh.ss” ~/Documents/filename.txt

Minus the quotes. it returns with no response and file not changed. It seems I’m not doing something right, or I can’t figure out the correct directory. Does anyone have an idea as to what path to use?

if I move the document and adjust the path accordingly just to iCloud Drive I get this:

touch: /private/var/mobile/Containers/Data/Application/1F9829C5-38B3-45B0-95B4-91AC30A
306F6/IMG_2433.JPG: Operation not permitted

I’ve tried copying that pathway and plugging in /Documents/filename.txt and it returns with this:

touch: /private/var/mobile/Containers/Data/Application/1F9829C5-38B3-45B0-95B4-91AC30/
Documents/IMG_2433.JPG: No such file or directory

What am I not getting?