"Oops, something went wrong." on Google Drive import to Creator

This is peculiar, because I've been uploading records to my Creator app via Google Drive for over a year now, and it's always done just fine. However, over the last month or so, anytime I try, I get as far as attaching the file and then get a mysterious "Oops. Something went wrong." error. I'm then booted back to the 'Choose a data source' page. I can download the same spreadsheet to XLS and upload it, which seems to work fine. My account has just stopped playing nice with Google Drive for some reason.

What could be causing this? There is no error code specified or any other information provided that might help me sort it out.

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