My title almost say everything I have to say 
basically I update my file, which I shared to test in private mode under my browser
and, at least on my side, the document is empty
which is not supposed to be
but if I download it, my data is there
at the left, the file in my brave browser
at the right, the file still in brave browser but in private mode via the a shared link
at the bottom, the file I downloaded with the data
How I could fix that ?