Hi Michael, yeah drag and drop does not currently work, but your copy/paste idea should be good!

Satoribomb - I also wanted to mention that File / Import and File / Export are also intended to be used for this kind of file merging stuff.

File / Import will merge the contents of the file you choose with the current model.

Normally if you do a regular File / Open, your current model is thrown away and replaced by the contents of the file you opened. Import does not throw away your current model, it just adds the other file you choose to the current model.

Then export is used to write only the selected objects to a file instead of writing everything.

So import (which could also be called "merge" files), and export (which could also be called "Export selected") can be useful for this.

- Michael