I suggest using the getcontainerattribute function to get the file name of a file in a container field.
Let's define things:
Getvalue is incorrect here
Container Field for picture
getcontainerattribute(picturecontainer; "attribute type) <--- read the help file for types
You can use this to extract all of the data stored by the photo
Using the attribute you can create fields for file name, size, created date, gps values, etc.
Each of these would be a calculated field using getcontainerattribute to extract the value.