Prerequisite: Have an active Database connection to execute SQL in. 1) Create a blank test course 2) Enable editing mode inside the newly created test course. 3) Click 'Add an activity or resource', and select a label activity. 4) Inside the new label form, name the label 'test'. 5) Inside the label form content field, insert an image, by clicking the 'Insert Image' button inside the Editor toolbar, and upload an image using the filepicker. 6) In your database shell, execute the following: SELECT id, contextid, component, filename, timecreated, timemodified FROM mdl_files ORDER BY id DESC; 7) Find the file entry for the file you uploaded to the label by matching the filename to the uploaded file. The component will be mod_label. Take note of the timemodified and created. 8) On the course page, click the edit menu next to the activity created, and click on 'duplicate' . 9) Run the same SQL command in your database shell. 10) Verify that the latest entry for the file uploaded is more recent than the previous entry from step 7.   Upgrade is covered by unit tests.