I have a very useful PowerPoint add-in in a .ppam format. I used the following method (Edit a .ppam file for customizing an add-in) to open it in VBA and slightly modify to better suit my needs. I would like to save the changes now, so that they are in effect whenever I open PowerPoint with that add-in. However, when I click 'File -> Save' in VBA Editor and restart PowerPoint, the changes I made are no longer there.
How do I save them?