Box has discovered some compatibility issues with Single File Collaboration and some integrations and desktop editing applications, like Box Edit. The release of Single File Collaboration is being rolled back while Box works to improve compatibility.
The option to “invite collaborators” added in mid-September 2017 on individual files will be removed from web and mobile applications. Any collaborators already added to the files will be maintained. Users that have been invited to collaborate on individual files will see that the “Open” button (in the web application) will be disabled. Once the compatibility issues have been fixed, the button will be re-enabled.
As always, collaborators can be invited at the folder level to edit the files in that folder.
The Collaboration Services Team