This happened with my last phone, Samsung S7 running Oreo (or whatever the most recent OS is) but it was fixed when I got the Moto X4. I like to keep a lot of songs downloaded offline because my service is terrible and I also spend a lot of time in the mountains. Before I I update my phone to the new Android Pie OS there was no problems. Now everytime I reset my phone I think spotify cannot see my SD card at first and tries to download all the music to its internal storage and I have to go back in and tell it to store it in the SD card. That is extremely annyoing but not the end of the world. What is really frustrating is that I think all of the downloaded songs are still on the SD card and just keep redownloading and taking up space. Eventually this will cause me to reformat the card which will be a major pain for me since I store a large amount of photos on there also. Is anyone else have this problem? I have already uninstalled and reinstalled the application so any other suggestions or help?
We just wanted to let you know that we've looked into this with the right folks now.
We are currently trying to resolve the issue. We don't have a timeframe for a fix, but we're really glad you let us know about this. If you have any other questions, just let us know!
Please look at what I think could be the problem (and possibly the solution):
I noticed that the SD card only mounts AFTER I unlock the first time after the boot. You can see it by the SD card icon who apears quickly at status bar just after the unlock. For security reasons, it make sense, since someone who stole the phone could try to load malicious software via external storage. Spotify service probably loads BEFORE the SD card mount, and then, like a mother who call the police when his son is 30 seconds late to come back home, it switches to the internal memory and starts to download all again. If the PIN is typed before the system boot, the SD card mount and when Spotify service loads, it can find the external storage. Works like a charm.
This solution did not let Spotify devs off the hook, since many other apps that use external storage didn't present this issue at all.
Make sure, if you have a PIN or password set, to Android ask BEFORE the system boot.