Hello @rsoika
As I can see you have already discussed this problem in one of your threads: Running OnlyOffice with Docker-Compose - WOPI - Connection refused while connecting to upstream
As my colleague @Alexandre stated in that thread, currently we do not have methods to achieve desired scenario with WOPI protocol usage. The suggestion to add Forcesave functionality for WOPI (internal number 58764) was created. Unfortunately, we do not have estimated date of the release of this suggestion available yet. Still, as a workaround, you can switch to usage API where Forcesave is implemented and works.
We are sorry for the inconvenience caused.