[TECH SUPPORT] LPS-46579

Hey Brian,

When we are exporting/importing files or folders they might be part of an exteral repository, and the staging is taking care of them. Ákos has applied the repository referring code to the FolderStagedModelDataHandler as well because it was missing for both import and export side.

He also resolved a small bug during the import.

I'm currently checking if we can write a test for this, but I'm not sure, because the problem is related to external repositories.

Thanks,

Máté

cc: @sergiogonzalez