All local music Songs are grey

[Cindyrela]

Plan

Premium

Country

 Germany

Device

Samsung Galaxy S7edge

Operating System

Android 8

My Question or Issue

 So I followed EVERY Step to add local music to my spotify playlist. I am in the same Wifi, I deleted and redownload the songs and App on both devices (phone and desktop), I made sure all songs are mp3 and I have enough space and it's just 10 songs not 3k so no limit reached. I also checked my firewall and all the other solutions the internet gave me. I can see the songs on my phone but they're grey so I can't download them. On my Desktop App it works and I can listen to them there but on my phone it doesn't sync so I can download. So any solutions what I can do there?

My Laptop has Win10 and both devices have the newest Version of the App 🧐