Hi, @gterri71
Welcome to the Canvas Community! You are correct: students can only upload one O365 file to their assignment submission. This is the subject of a recent feature idea that you can support by voting and commenting on https://community.canvaslms.com/ideas/14791-multiple-office-365-attachments
Turning to the issue at hand, I'd suggest submitting the assignment with the Word doc, then resubmitting it with the Excel attachment; in the second submission, enter a note to the instructor in the comments field to the effect that you have completed the assignment via two separate submissions. While you will only be able to view your most recent submission, your instructor will be able to view and assess both.
Good luck!
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