I take a photo with iPad in a container field. Now I want to insert a symbol in a point over the photo (over the container field). The symbol maybe a character or png transparent picture. This symbol have to a ID field inside database linked to data. I can have many symbols over container field. It's like a geographic map with symbols over the map at specific coordinates. I want to substitute the map with normal photo.
I tested many solutions but nothing is good: the most near is to create a trasparent grid over the container field and any cell of grid is a clickable boolean field : 0 is transparent, 1 is red transparent and this field is linked to data. This solution is partial.