how to set up a little RSS feed I can host mp3 files and use that link to subscribe to in a podcast player

I use pocketcasts for my podcasts, and I also sometimes manually drag files into it, since for me its the BEST platform for listening to long form content. If there's a 10 part series on youtube, Ill download the audio and just drag the files in.

I also have an older friend that I wanted to share this link with, since he listens to podcast long form, but would never go to youtube and listen or watch a 3 hour video.

It would be nice for me if I could just set up a folder that I drop files in, and then I can use that to share with my podcast player and my friend and just download, stream, and track progress there (so i can leave off during an episode and pick right back up from phone, pc, whatever).

I ONLY want this link accessible by me and him, no one else for obvious copyright reasons.

Whats best tool for this? I use unraid, so im hoping theres a docker app that I can use for this!

Thanks!