Copied instructions from previous upgrade. Run behat tests @assignfeedback_editpdf (CI will do this). For annotate pdf to work, please ensure that you have ghostscript installed on your system. Go to [Site administration ► Development ► Third party libraries] and check that FPDI is version 2.2.0. Create an assign activity. In Feedback types make sure that 'Feedback comments' and 'Feedback files' are checked. As a student submit a PDF file. Log in as a teacher and grade the assignment. Launch the PDF editor. Add each of everything from the bar at the top. Save changes and make sure that no errors or warnings are produced.   Run behat tests @assignfeedback_editpdf on php7.1 - to account for custom patches in MDL-55848 and MDL-60301