I'm looking a music player focused on local media (stored in my phone's SD card)
I used foobar2000, but I found creating playlist incredibly tedious so I changed to VLC, which is ok, it let me choose a bunch of files and add them to a playlist, but both share the same problem. When I change my SD card for a new one I have to start from the scratch and create all the playlist again, and that's a pain in the ass
So I'm looking for a audio player that let me easily export and import the playlist I create
Give Musicolet a try, I recently switched to it after trying a few other players. I think it should be able to do everything that you're after, you can create, import & export playlists. I also sync my playlists from MusicBee on my desktop to my sd card on my phone & found Musicolet to be one of only a few players that would recognise the playlists properly.