gtsave() can't overwrite .docx document. Return pandoc document conversion failed

[AlexandreGareau]

Description

I am able to use the gtsave() function to save .docx file. However, the gtsave() function return this error when I attempt a second saving after some modification.

I realized that if I erase the original file, then the gtsave() function works. Thus I describe the problem as gtsave() being unable to overwrite a .docx document.