Follow along with the video below to see how to install our site as a web app on your home screen.
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You can add the pictures, album art I assume, directly to your mp3 files. This can be done on a computer, or on your phone. I don't recall how to do it on the computer, but Google can help with that, but on your phone, look for an app called iTag inn the play store. This let's you change things such as who the artist is, what the name of the song is, and add/remove/change album art
With the art directly on the mp3, no need to keep the pictures on your sd card