Try using the render function and export the file.

I have never used the drag/drop in BB/RB.

I always use the export function for the waves in RB. And I rarely if ever export anything from BB. I always reopen the project in RB after creating it in BB. I generate the waves and export them one by one to my DAW.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.