A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Site Collection administrators are given full control over all Web sites in the site collection. The author of the file is not necessarily a site collect administrator, you can upload the file to the site even if you are a member of that site when you have permission. You can contact SharePoint Online administrator as well, they can check the site collection administrator in SharePoint admin center.
Best Regards,
Zixuan
Hi Sir,
Alright understood. I will ask the Online Admin (my superior - IT person) regarding on that and the permission that the Collection Admin set for the Excel workbooks. Will update you soon.
Thanks Zixuan!