Copy a shared doc with a different team and make it private

I want to duplicate a document I was working on with a team outside my org. After I’ll copy it, I want to make it accessible only to my org. The only way I understood I could do that is by saving it as a .fig file and then importing it to the org. The problem is that Figma keeps failing, saying it ran out of memory. I have 32gb of ram and it looks like it’s not getting to full usage.
Any other solutions?