When you upload an image you will be asked to crop the image to fit in a standardized set of image sizes. If you only see one image size and wish to see more, you will need to change your view setting from collapsed to expanded.
After you have completed the first step to upload your image (you have selected your image and completed the image details), you will be taken to the second step where you are asked to crop and pan the image.
If you can only see one image size and wish to see more, click on Collapsed in the upper right-hand corner of the screen.
This will change your viewing status to Expanded.