Hey

I've just tested this in version 0.19 and aren't able to replicate the issue you're having.

Can you make sure that you have logs turned on under Settings > General > Tools and try the import again, then send us the log files generated in your Music/MIXO/Logs folder.

This will help us to see what could be causing the import to fail.

Can you please also send us a screenshot of the import error shown in the app?