You have to define your insert to allow interaction.
The latter is defined to allow interaction, the former is not.
Try with this calculation for the auto-enter option of the container:
"image:" & Substitute ( Self ; "file:" ; "" )
It's not completely logical, but works.
"image:" & Substitute ( Self ; "file:" ; "" ) in the autoenter portion of the container file gave me file not found errors with 'do not replace' unchecked... with it checked I can see no difference in standard behavior?
I am using external open storage...
still investigating.... I used a normal container field (local) and it appears to work. What's more, changing the auto enter to "file:" & Substitute ( Self ; "image:" ; "" ) works too, in reverse stopping the display of thumb nails.
now if only I can figure out how to make it work with external open storage.....
so far, no joy.... It seems you are not allowed to use "self" with external storage of containers...
If user right clicks 'Insert File' instead of file type (i.e.. 'Insert Picture') you won't get the image preview, just an Icon.
I've been guiding users against using 'right click' functions in FM12 eg. insert file/insert picture/insert movie etc. Believe only there for backward compatibility.
In FM12 use 'Insert File' script step (behaves differently from right click insert file). Need to ensure 'Display: Content of File (when Possible)' is chosen in the dialog settings.
This new script step takes care of file type & interactivity for any file type supported. If user drag & drops seems essentially using this new script step behaviour. Can attach this script to a button and place near the container.
I did briefly mess around with security settings & allow field entry settings to try and remove right click options but still allow drag & drop but couldn't find setup to allow both so have just put a obvious 'Insert File' button there for now.