Saving teach & play files in uArmStudio

The interface in uArmStudio seems to indicate that teach & play files can be save for later playback. No file seems to be saved when I click the pencil icon. The saving location seems to be ~/uarm/Studio/TeachMode but no files are saved there.

Can I create an empty file then save to it? If so, what would be the appropriate file extension?

Thanks,
Kelsey