I use iCloud Drive as my cloud drive / solution. I have many Excel files stored in iCloud Drive. Most of the files I can save with no problem. One file -- and one file only -- always "gives me a problem" when I try to save the file on iCloud Drive after making a few edits by displaying the following pop-up window: https://www.dropbox.com/s/74uvbve8w96xi0i/20190519_macrumors forum_excel file in icloud.png?dl=0 Would appreciate any and all feedback as to a) what causes this to occur for this one Excel file and b) how can this be fixed. Thanks.