Saving/Opening Workbook issue

I have a workbook titled "Workbook" and it contains 3 worksheets, each individually named. When I try to open the workbook, it opens the workbook with the name "workbook1", if i try it again "Workbook2" etc... attempting to save the file with "Save" and it tries to initiate a "Save as" where I can change the file name, location etc... If I try to save the file with the same name, it creates two files in my folder, with the same name, no option to overwrite existing file.

I am using Office 365 on my Mac. My folder is located in my onedrive folder.

maybe you've template (xslt) not xlsx/xlsm extension.
or
right click on the file, then un-tick read only

That worked. Thank you very much!

You are welcome

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Thank you.