vim cannot write a file being saved by OneDrive but Notepad++ can

Has anyone else seen this?

I have an existing text file (foo.py) in a folder backed up by OneDrive.  I created the file using Notepad++.  I opened the file using vim, modified the text and tried to write it (":w<cr>").  I get the following:

"foo.py" E514: Write error (file system full?)

WARNING: Original file may be lost or damaged

don't quit the editor until the file is successfully written!

Notepad++ can read and write the file just fine.

Any ideas?

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