Local songs from Desktop skip on Android

[lukasheupel]

Hi, 

I downloaded two songs as mp3 and put it into Windows Media Player. Then I imported them into Spotify (local Files) and put them into a playlist. 

On my Desktop both Songs work perfectly fine but when i want to listen to them on my Android they skip after a while (always at the same time). 

I already reput the songs into the playlist but they still don't work on Android. Please help