I add local files (mp4) to Spotify on my PC, then add them to a playlist. When I go to download the playlist on my Android phone on the same wifi as my PC, they don't download. The tracks remain gray and have a "!" before the name of the artist. I have tried every possible solution on this forum and nothing has worked to fix this. I have checked the firewall, deleted all Spotify data on my PC and phone, restarted my devices, and nothing works. I am able to play the local files on my PC but not on my phone.