Test on one device of your choice Installation (you can skip this by using "Assignment with unsupported submission plugin" on dev testing course on master site) Install a 3rd party submission plugin (not supported by the app, ie Snap) Add an assignment with the 3rd party submission plugin selected. Test In the app, as an student open the aassignment created Check there's a message at the bottom descriving the problem: You can't add or edit a submission in the app because certain plugins are not yet supported for editing. Check there's an "open in browser" button Click and check you are redirected to the edit submission page of the assignment in the site.