I assume this is for a photo. That's the only upload I know of in Member Tools.
I don't know how the interface works for iOS. Have you selected a photo? Is it an acceptable size/format? Is it for someone other then yourself?
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.