Lining up the Label Icons in the Labelled Graphic lesson

As a workaround in the meantime, try this:

You have your image already, so keep that copy.

Where the ticks are (which I know aren't on your actual image, place a vertical line, and save that. This is your point of reference. Using the same image as the original means that the image size is also the same.

Upload the new version, place your ticks on there using your new vertical line as a guide. Then, replace the image with your original version. Bingo :)