Can't collaborate in Numbers now after updating to MacOS 12.7.
I recently opened up a Numbers sheet with which I collaborate with someone else on my 2015 MacBook Pro, and got the message "Can't Collaborate: To collaborate, you'll need to use Numbers on iCloud.com or Numbers on a newer Mac." Everything is updated - 12.7 Monterey, and the latest updates for Numbers. Is collaboration no longer offered for older machines? And, if so, what is the cut off age for collaboration? Thank you!
MacBook Pro 15″, macOS 12.7