How to know opened onlyoffice file name?


I am a onlyoffice app beginner of NC15 admin.
I want to know that what file opened by each user by nextcloud.log.
I checked audit.log. and grepped by keyword “onlyoffice”. Then appeared.
I think maybe key URI’s value shows file name. But those are not readable.
How can i decode encoded file into readable name ??
Or to achive, I should check logs from ONLYOFFICE ??

[ example of URI value of nextcloud.log ]