if you have an old pc/laptop tying around and some storage, it`ll not cost you a penny to get up and running.Plex easier to use but more restricted if you dont pay for it whereas Jellyfins entirely free but requires a bit more work

I love pixelfed,I don’t love the developer…this isn’t going to do his already huge ego Amy favours

I didn’t see the file sync part.for that I use next cloud.which works great but my he overkill if that’s all your going to use it for

KDE connect!

docker sounds scary but its dead easy, and makes keeping things updated a synch !