Changing an repo icon in Safari in iOS does not let you move the an certain area of the icon.

On windows ir any other systems when setting the repo icon I can click on the icon itself and drag it to the area, on my iPhone I can only zoom it or out. There is got to be an way that after tapping that image box to have it where my fingers do the same thing as I can on my laptop and then press Done or something after that. Or maybe an mobile web mode of the repo settings perhaps that allows this?