Hi there!
The root cause is typically the content bytes of the file. In many cases, Excel Web will open the file, but not the case in Desktop App. BUT you can fix this pretty quickly, there's the flow.
Start with a trigger and make sure to Include Attachments/Only With Attachments = YES
That's going to bring over the content bytes in the format you need.
Next add the Create file action. As you know, this is going to wrap itself in a "For Each" loop because there may be more than one attachment...so for each attachment, create file.
The dynamic content you are selecting is the attachment name and content bytes.
You can do more here with trigger conditions and standard condition actions, such as checking if the attachment is an Excel file, etc, etc but this is enough to resolve your content byte issue. Build, duplicate, save, and test.
As the old saying goes....works in testing!
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Tom
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