Hello!
I'm using gallery to allow folks to upload two Excel files, do some transformations and unions, and then download the new Excel file.
Everything is working great, except when I run it and try to download my file, it doesn't allow me to choose a file type.

In my workflow, I specify Excel format and provide it the .xlsx file type. Can someone help me fix this?
PS If I donwload it as 'unknown' type and add .xlsx to the file, it'll open as expected in Excel. My users just might get confused and struggle with that last random step.
