Hi,
thanks for responding.
I've tested all Metabox image fields. None of them seems to work with Gravity Forms.
Other Metabox field types, like text, textarea, checkboxes, radio, number etc work fine without any problems. Only image fields don't seem to work.
And yes, I'm aware that the fields need to be populated in order to be found in the database. Otherwise I wouldn/t be able to find the field ID as a mappable field within GF. That's not the issue. The issue is that GF doesn't seem to be able to populate any Metabox image fields.