Import framework Big Sur

I am dragging the AppKit.framework folder to Omnigraffle and I get this message.

The document
“AppKit.framework" could not be
opened. If this document was
created by a newer version of
OmniGraffle, it may use a format
that this version of OmniGraffle
does not understand.

Then I dragged a finder folder to it and got this message.

OG 7.18.5 M1 Mac Mini 16G/512G 11.5 so what is the deal?
Does it work for anyone else?

So I copied the AppKit.framework to my other Mac running 10.13
It opened fine ! ! !
What a piece of shiza.