Finding container data

[Mark B]

This seems like a really stupid question, but I've never worked with container fields before now. Once I have data (photos) in a container field, how do I find records that contain data in a container field?

[transpower]

You need to add a text field which describes the photo or gives the file name (if that's descriptive). This will function as the "caption."

[MarkWilson]

not IsEmpty( ContainerField ) will return a Boolean value that, to my suprise, is indexable.