I like adding thumbnails to the mp3 files I upload, but it would be nice if I could do that during the initial process of importing the audio file instead of waiting until after the import is done to do it. There doesn’t seem to be an option to do so.
Try using the batch import option – even if you’re only importing one lesson. I use the batch option exclusively. I usually have my own transcript to upload, but I assume that’s not required if you want automatic transcription.