Thank you for the suggestions, I managed to find a solution that works for me.

Setting up hardlinks to the original file in other directories through Linux allows the data to be accessed from both locations and is detected by (seemingly) every OS!

This is probably a very clunky way to do it, but it works for what I’m currently looking for.

Yes, I’ve done that.

I wanted to be able to have all my movies in one folder while having shortcuts to those movies in genre-specific folders. All on the same NAS

And would I be able to send files from the Android phone to the server?