This variant isn't based on anything in our database.

[BrokeDad]

It seems the new models in RF-8 are not in the database for the swap pages. So variants and probably CS's can't be uploaded there. Hopefully they can fix this.

The following message appears when I try to upload my Gremlin 560 variant of the 280:

This variant isn't based on anything in our database.
Please export the entire aircraft and upload that instead.

 

[Ryan Douglas]

This was an oversight. It should be working now. Please try again, and thanks for reporting it!