Hello from a first time Trailblazer user!

I have been using Doug Ayers great instructions (https://douglascayers.com/2017/10/19/convert-googledoc-records-to-salesforce-files/)

regarding converting old GoogleDoc references to Salesforce Files (and keep the working link in Lightning). I successfully ran through his instructions earlier in the year, during a trial migration on our sandbox.

However, now I’m attempting a live migration, I’m hitting an odd problem. The record is being inserted via dataloader in the right place, it links to the correct location and is owned by the correct person. But the preview window shows the error: ‘File not available. This file isn’t available anymore.’, as does the ‘Download’ link. But if i click the ‘open’ link at the top, the file opens just fine.

Is this likely to be a configuration or import issue? Or is Salesforce simply not able to show the preview of the imported file?

I could have sworn that the preview worked earlier in the year… whilst we might be able to live without, it’s still a very misleading error message, as the file does in fact exist.