Send data without headers from Excel and receive it in Excel doesn’t appear to work anymore (see screenshots below). A colleague experienced this issue when trying to send a list of numbers from GH and receive it into Excel, but I can imagine this issue can be solved with just looking at the Excel connector. Plus the Excel > Excel use case should work as well.
Example commit on XYZ: Speckle
The commit is created by selecting a very simple Excel data set using “Set range” (so without headers):