Hello,
Sorry for my google translation English.
Here is my problem under Onlyoffice.
When I modify under Onlyoffice (world, excel or others) this one indicates to me record made.
But when I download word file and open it on my post the changes visible under onlyoffice does not appear
this is a very common issue with OO. It is most often caused, by some SSL certificate issue. I had the same issue and solved it through this post from the OO forums: