Freeform: can't share board
I'm running the latest Ventura (13.4) and experimenting with Freeform for the first time. When I first launched the app, it asked me if I wanted to enable iCloud Drive saving; I clicked yes and made sure it was turned on in the preferences.
I did a good hour of work creating a board. But now I'd like to share it with someone. When I go back to All Boards and right-click on my board then click share, it tells me, "Can't share board. This board is still uploading to iCloud. Try again in a few minutes."
I've waited half an hour now. There is no extra media in my board (just text). It should be a very tiny board requiring negligible upload time. Also, in the Finder, I went to my iCloud Drive, and I don't see a Freeform folder there. So I don't even know where my board is currently living. It'd be a great shame if an hour's worth of work got lost. How can I fix this?
MacBook Pro (2021)