If you hover over the left or right edge of an image, you should see an arrow appear rather than your mouse pointer. Images can only be expanded by dragging horizontally, not vertically, which may be why trying to click the corner wasn’t working for you.
If you hover over the left or right edge of an image, you should see an arrow appear rather than your mouse pointer. Images can only be expanded by dragging horizontally, not vertically, which may be why trying to click the corner wasn’t working for you.