Can´t play my downloads offline mode

[algtz]

Plan

Premium

Country

MExico

Device

Samsung 

Operating System

Android 

My Question or Issue

I nedd help, I have a premium account, but when I download my playlist and turn to offline mode, can´t play song´s . The green arrow is right, but not play a song, just change and change, but not play. I´ve already erased caché, reinstall app, erase my offline devices and nothing works.