No nah nope. You don’t need an app for this. You need the classic hierarchical file system and good folder and file names. I put it all in a VeraCrypt volume so it’s secure if the device is lost or stolen.
Such as?
1. Make your own according to your own needs (what I do). 2. Copy one of the other comments here. 3. Something yet more structured like https://johnnydecimal.com/
Don't forget about symlinks. They can be helpful