Audio assets cannot be added to new folders

[adam-coster]

During a Stitch session, if the user adds a folder and then tries to drag-drop an audio file into it:

• The asset does not appear
• There is no error message
• The asset does appear in the project files

[adam-coster]

This was reported by Fat Bard, but I can't replicate. Awaiting info!

[adam-coster]

Assuming this is no longer an issue until I hear otherwise.