How to know opened onlyoffice file name?

Hello,

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 ]
/donsen/index.php/apps/onlyoffice/track?doc=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJmaWxlSWQiOjQ4NSwib3duZXJJZCI6ImFkbWluZG9uc2VuMiIsInRva2VuIjpudWxsLCJhY3Rpb24iOiJ0cmFjayJ9.FYnm2TVDC6cjyosUPjQwi6XvS5yLbYV567S6KXycCTk