Thanks for posting in the Community and sharing what you tried the resolve any issues with the local files.
If you're still experiencing this, we've gathered all steps that have worked for most users bellow:
Make sure you import your local files by following these steps. Keep in mind that only files from official sources are supported.
Perform a clean reinstall of the app. You can find instructions on how to do this here.
Try importing your files using a different network connection
Delete the playlist with the imported files on all devices and create a new one.
Change the source of the local files. Create a new folder in a different directory on your device and move your local files to this folder. Then just delete the old folder used for the local files. Now you can try importing the files again.
Tried everything you listed. No dice. The mark offline fix doesn't work since there's no offline button on pc and the sync desktop files button doesn't show up on my mobile version. I am up to date on both versions of my spotify. The tracks play on my laptop and are downloaded properly it just shows me a blank playlist on iphone though.
Been having the same issue for months now too. Scrolled through hundreds of different threads trying to fix this problem, nothing seems to work! checked firewall, local files toggle, deleting/redownloading, you name it. I used to have all my local files uploaded and accessible on my Spotify app, but i accidentally hit the download toggle on my playlist and all of my local files songs disappeared. I haven't been able to download them back onto my mobile despite ALL EFFORTS. someone plz help 😞