@Charmicat what messages do you mean? Poweramp uses (hidden from gallery) internal cache folder for album art. As for embedding, there are 2 problems with that: 1. legal. Using album art from internet is OK but embedding may violate some countries copyright laws. 2. technical, as if we embed images en-masse on the mobile device and Poweramp is killed by system, we'll get corrupted file (esp. if that is huge flac, ape, etc. file or file located on slow sd-card).