When I first posted this problem I tried all sorts of things and nothing worked. Since then, several weeks ago, an update to Numbers app (for iPad) was released and the problem went away :) . I've got some pretty big spreadsheets that I developed on my Mac and then downloaded to my iPad via...
Same problem "an error occurred" is all I get
I guess I'm just commiserating with you. I have the same problem with Dropbox and I also emailed a copy of the file from my Mac to me on the iPad. Same thing!
I'll keep working at it. A better message than "an error occurred" would have been...