The way the File column Viewer renders uploaded Excel files makes the Viewer virtually unusable with them.
The view of the spreadsheet is considerably “blown-up” or magnified for all of my teams uploaded Excel documents - to such a degree that the columns are disjointed across several (viewer) “pages”. For example, the first column of the spreadsheet takes up it’s own page, the next column another page, the next another, etc.
A better solution would be to have a single tab/sheet inside of an Excel document render the entirety of the enclosed data as a single (viewer) page. If the tab/sheet is sufficiently “wide” it would be “zoomed out” in the viewer - however, this alternative at least leaves the possibility of “zooming in” to the rendered page, rather than disjointing all of the columns across multiple (viewer) pages.