Dux-Soup does not recognize my file format

In order for "Revisit Data" to work, make sure your document is saved as a CSV.

You can do that by clicking on File > Save As... on your Excel 

Then save it as a CSV 

If you uploaded the file but are still getting error messages stating the file format cannot be recognized, try reloading the extension. You can do that by going to Options > User tab and hit "Reload Configuration", then upload your file again.