It means what you did cannot be saved and shared.
But it is really annoying when you get the error message-unable to save excel file.
Microsoft Excel plays a significant role in our work, which helps us to handle a great number of documents. I use Microsoft Office 2016, excel document not saved, how to solve? Help me!” But at last I was unable to save this Excel file. 'I got an Excel file and modified the data according to my needs.