I have two Microsoft Excel documents that are, except for the data contained within, virtually identical. One was created as an offshoot of the other. In the Finder, the original displays a thumbnail for the icon but the offshoot copy displays the standard Excel icon with the (XLSX) "button" in the lower left corner.
- "Save As" and giving the file a different name. That didn't work.
- Checking Get Info on both and the only anomaly I see is that the offshoot is a larger file, despite containing fewer tabs and less data.
How to make the Finder show the icon thumbnail for all Excel documents?