First of all this new feature is very useful - thanks!
Some suggestions for improvement:
When the import completes, the file is listed in the interface and it can be downloaded. This is of no use, it would be much better if the link went to the new Xert workout.
In Import Settings, the options could do with some explanation. For example I have been using Xert for several years and I’m not sure I can remember exactly what XSSR is. Perhaps include some tips in the Notes section or list the pros and cons of the various conversions options.