Every file I try fails to upload to dropbox, I have tried

Logout, then login again.
- Reconnect your cloud storage.
- Connect to a different network (can fix temporary blocking issues from cloud storage).
- Check your router/firewall isn't blocking traffic.
- Check your filePaths are correct and the tracks exist (eg they should play in MIXO).
- 'Cancel Upload' wait for sync to complete, then try uploading all of the tracks in a single playlist to see if it works:

I have even gone as far as completely removing Mixo, signing up with a different Email and setting up a brand new dropbox, still nothing