Look into waltr: https://softorino.com/waltr/

It’s perfect at what it does.

This looks great. I actually wood prefer a third party app though because using the stock apps means that audio auto plays when connecting to some Bluetooth devices. It drives me insane that every time I get in my car some audiobook I was listening to starts auto playing.

Actually, that's why I bought an Android device. I got enough of this iTunes bs and searching for 3rd party apps to do something as simple as copying an MP3 file or e-book from my computer. And still, I have to buy and install some software as Apple want to make it as difficult as possible not to have them as the intermediary. So now I carry two: iPhone for general use and Android for listening to music, reading e-books and many other things.

Are you aware of a Linux-supported app that provides the same functionality for iOS devices?

Thank you!

Doppler only supports importing from Music.app which is synced with iTunes at the moment. Importing from other sources is coming soon (within the next couple of months)!

So there is a plan to add "Application supports iTunes file sharing" (UIFileSharingEnabled)?

I’ve used iMazing and FileApp Pro on iOS for years and years - I had ripped hundreds of CDs at a reasonably high bitrate with EAC not long after that first became possible on Windows - wanted to bring them over just as they were - once that’s all set up, it’s just drag and done - bonus, same folders dragged to a tiny flash drive on my keychain and I can plug it into hotel TVs, many rental cars, friends’ audio systems, etc.