This new FileMaker 13 function gives you a pretty impressive list metadata about the contents of a container field – stuff you can use to improve your client’s interactions:
A couple of use cases that we came up with where this metadata would be useful:
Using the filesize attributes to reject files that are too large for container fields.
Using image width/height attributes to show/hide different portrait/landscape container objects.
Using the Latitude/Longitude attributes to verify photos were taken in the area they were supposed to be captured.