Local files on android

[Jazz2]

Plan

Premium (family)

Country

The Netherlands

Device

Huawei Mate 10 Lite

Operating System

Android

My Question or Issue

I have some local files downloaded on my laptop and everything is fine, I can listen tot the music whitout any trouble. Buy when I try to do the same on my phone it doesn't work. Every songs is greyed out and it keeps saying that it is waiting to download. I have tried everything I could find on the internet to get the songs to play on my phone too but nothing is working. Does anyone know what I could do to make it work?