Final answer:
Before selecting the desired alignment method, make sure that the objects are on the same plane or level.
Step-by-step explanation:
Before selecting the desired alignment method for objects on different layers, it is important to ensure that the objects are on the same plane or level. This can be achieved by adjusting the position or elevation of the objects.
For example, if Megan is trying to align a text box on one layer with an image on another layer in graphic design software, she should first make sure that both the text box and the image are positioned at the same height or on the same baseline.
Once the objects are on the same plane, Megan can then choose the appropriate alignment method, such as aligning their top edges, centering them vertically, or aligning their bottom edges, depending on the desired layout.