Many apps (including MS Office apps) on the Mac have a button called “Share” that makes it really easy to do such things as invoking an email client to quickly send a document to somebody else.
E.g.
or
For almost all purposes, this is the one feature that is still missing from OnlyOffice and so extra effort is required to (say) send a document. You have to find and open the folder in which the document was saved, select the right document and then either drag it to an email client or use the Share icon that shows up in Finder windows. For non-tech users, this (believe it or not) gets complicated.
Would be really nice if this was built into OnlyOffice.