Hi there, @HomicidalHugz. 👋
Thanks for posting about this.
I moved your post over to this existing thread: Android: Offline content with new mobile device
Your offline tunes are device-specific. This also means with Pandora Premium, you would need to manually download your offline content again on your new device.
For offline downloading, I would recommend leaving the Pandora app open (in the foreground) while plugged into a power source. I would also wait for albums and playlists before moving to the next one. Larger playlists can slow down the download process.
If you're interested in having your downloads automatically restored, I would recommend checking out this idea. You can upvote this request by clicking on the 💙 icon next to the title.
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