@Leah_Kern
I also have no idea :), but I was able to find this information for it.
Maybe this information will help you a little bit further.
File formats supported in Excel for Mac
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The file formats that are listed in the Save As dialog box vary, depending on what type of sheet is active. If you are saving your file into a different format, in most cases, Excel converts only the active sheet. To convert the other sheets in a workbook, switch to each sheet and save it separately.
Thank you for your patience and time.
Wish you a nice day / night with lots of health, joy and love.
Nikolino
I know I don't know anything (Socrates)
