How to insert an object (e.g., a file) into an onlyoffice document file?

How to insert an object (e.g., a file) into an onlyoffice document file? The object is not linked to the document but instead embedded in the document. The object shows as an icon in the document and can be opened by double-clicking the icon.

OS version: windows 11
App version: 社区版 9.0.4.50 (x64 exe)
Downloaded from: ONLYOFFICE website.

Hello @ruanj

Unfortunately, currently there is np way to insert a file into a document. Such enhancement was registered previously, we are working on it.