In some rare occasions, the import is finishing with an error. It's on Figma's side. Figma is sensitive to your machine GPU and RAM. For the first, try to re-import via the browser app. Yes! Figma works in the browser. Simply open figma.com, then sign in and drag and drop .FIG file again. For the second, if there's no effect, you can message us
and we will send you a direct link for your copy, so you can duplicate it and start. Don't panic, you will get your system in any case!