Excel file corrupted after recent edit

I edited an Excel file yesterday, saved the changes and uploaded it. Today when I try to open the file I get an error message, ‘‘Can’t open this document - Spreadsheet appears to be corrupted’’.

The vault can be opened and I can view the file but it says 0kb file size.

Removing the vault, and adding it back again does not fix the problem.

I am using the Android app ver 1.12.2 and Windows App - same error on both.

Is there anyway to restore the file to a prior state?