Window says loops I chose must be downloaded. But they're not showing up in exported clip

Hi

For use in FCPX as needed, I added a bunch of loops to a "timeline" in GB, some of which a window said had to be downloaded and installed, which I then saved—all time consuming, then shared the collection as "Export song to disk".

But when I import to FCPX, there are blank portions where the downloaded, installed and saved loops were.

How do I get them included in the exported "song to disk"?

Best

Royks