jellyfin unable to access files on external and internal storage

[TheDreadPirate]

Unfortunately, I can't get enough feedback and information and you aren't able to do the basics.

This is like asking a blind person to drive while I give them directions over the phone.

Even more user friendly Linux distros require a level of knowledge you don't have yet. If you're more familiar with Windows, I'd suggest using that as a server. Obviously that is not possible on a RPi. But a cheap, used PC or laptop can be used as a server. I'm not sure if that is an option for you.