I had the same issue. Being a poor fan of installing new soft where native one is already featured, I followed the advice here askubuntu.com/questions/131570/how-do-you-make-ubuntu-accept-files-sent-over-bluetooth which didn't help at all (mandatory, although not enough). Then I looked in dconf-editor, tried to enable "bluetooth-allow-write" which didn't help too (so I redisabled it), also tried to change "bluetooth-accept-files" from "bonded" to "always" with no luck always (so set it back to "bonded" which is the gui option "Accept files: Only for configured peripheral" I want below "Receive BT files in Download Folder" from gnome-file-share-properties).
In the end I felt fed up with this ubuntu thing, so I decided to install blueman like in the ~good~ old Windows95 years. Then it worked !!!!
So I removed blueman and it still works. rubbish