On my previous phone downloading worked on its own and syncing the position of streamed files worked but the position of downloaded files wouldn't sync.

However I just switched phones and now downloading doesn't work at all (if I try to add a media folder outside of the Downloads folder it will get permission errors; if I add a folder inside the Downloads folder it will allow me to add it but the app will crash whenever I actually try to download a file).

Basically it just seems to be incredibly buggy so maybe it's just a crapshoot whether it will work on your phone.