Local file downloads to mobile no cover art

[Narrow]

I bought some music off bandcamp and downloaded it and added it to the local files on my spotify, i then added it to my phone by adding the file to a playlist, connected my desktop and android phone to the same network and downloaded them.

My problem is that the album art has not transfered just the audio files, the album art is their on my desktop but not on the mobile app.

Its not a massive problem but i'd really appreciate it if anyone knew what was going on here. 

Thanks!

[Joe]

I think the album art has to be included in the mp3 tags for it to display. There are plenty of free tag editors which you can use to do this. I like mp3tag.