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Songs downloaded from Youtube work on Spotify app for laptop but not mobile

Calibrations39
Regular
Hi, Pretty explanatory. I downloaded a bunch of songs from Youtube using a Youtube-Mp3 converter, moved them to my Spotify app for my laptop, but they will not transfer/play over to my mobile app. Some songs will transfer over to my mobile app, but if I try to play the songs I get the "Song cannot be played" error, and the song is greyed out. The songs work perfectly fine on my Spotify laptop app. I have both devices on the same network and same log in information so I don't know what's wrong. Please help.
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