Here are some steps and points to consider when dealing with OneDrive files not showing up on your mobile device:

1. Check if the OneDrive app is up-to-date
2. Check you have network connection and your device is linked to your work/school or Microsoft account
3. Quit and restart the OneDrive app
4. Disable mobile data in Settings > System > Offline files
5. Restart your device

For more information on OneDrive mobile troubleshooting, reference the Microsoft Support website.