We utilize opening up Excel files on box.com using the Open button on the upper right of a file, "Microsoft Excel Online". We have noticed that almost no files have the option available and we cannot figure out why. We have been using it daily for a year. Is these any reason why an excel file would not be available online while another is not? I have tried saving various types of Excel files (.xlsm,.xlsx) and none of them work when .xls doesn't work.
Any idea what is going on?