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Sorry, unable to open the file at this time

Problem: The File Upload Form returns a error page with a message saying:

Sorry, unable to open the file at this time. Please check the address and try again.

Cannot Open File

Solution: This error likely happens when the authorization is revoked for your Google Script or if you have changed any of your Google account settings.

You can republish the web app with a new version and it should resolve the issue.