It´s true that I´m trying with my songs I recorded in my guitar + vocal but it´s a mp3. I really don´t know what more can I do.
Some songs come from the desktop to my iPad but not all of them. I created a playlist with them and some are avaiable to play (white color) and ther others (in grey) I have a message: "SONG NOT SYNC: if you are the owner of the song you can sync from your desktop"
Totally agree mchiarrli. Spotify does something similar, in that, you do upload your music, but the actual MP3 has to be on your device which takes up storage space. Google allows the user to listen to their music via the cloud and store on their device if they want. It is a welcomed choice.
I tried to add all local files to a new playlist and set the playlist offline, but the sync won't start. BUT if you tick the plus icons to the left of the song titles in the playlist and thus enable offline mode for every song one by one it works. It's a bit annoying but works.
This worked like a charm. Key was opening Local Files, and then playing the song. Weird, it didn't play, but immediately showed up as available in my phone Local Files and in the playlist I created available offline.