This file can't be opened.

I have got a file I have worked on for ages that was on iCLoud and it for corrupted and started saying "This file can't be opened."
So I went back to an earlier version and did the work again saving it on my mac.
Now it is saying again:
"This file can't be opened."
1) Is there any way of salvaging this file?
2) Given the way apple have made it harder to save incrementally as you work what is making my files corrupted?
3) The file was a multi sheet spreadsheet. Am I being unrealistic thinking Numbers can handle this?
Best Tommy Banana

I suggest backing up the file using Time Machine.
You can also use the menu item "File > Revert To " to see all versions

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