I moved to a new MAC. I used to have capability to Open my XCEL files with "Open with MS Excel Online" -- this way I don't override someone else's updates.
Now I have to lock the file, and open with Xcel, then make my updates, save, then unlock the file. This is not only time consuming but inefficient because I prevent others from updating the file when it is locked.
How can I get the ability to open my xcel files "Online" again ?