Missing option to create new event using files ingested from the inbox

Steps to reproduce:
1. Upload video file to (correctly configured) inbox directory
2. In the log, message "Ingested PATH_TO_INBOX/FILE as an inbox file" confirms that inbox file was successfully ingested
3. in admin UI, choose "Add Event", and in the following dialogue there is no additional option "from inbox" (or whatever is was in former releases) in the source panel

Actual Results:
Files processed from inbox cannot added as new event.

Expected Results:
There should be an extra option for inbox files in the "add event - source" dialogue.

Workaround (if any):
none