Hello,
Please reproduce the scenario and provide a screenshot from the Console tab of the browser dev tools. Also attach Document Server logs from /var/log/onlyoffice/documentserver/
Hello @votouch
If you don’t mind I will join this thread too. Please clarify the file format of your file (doc\docx) from your test. Additionally, was there any error lines in the Network tab of browser console?
Hello @przygopawel
As far as I can see, you have contacted us via Zendesk on the same issue already. Please continue communication on the created ticket.