Ok, thanks, solved that problem.
1. On the product_update page I can't get the hidden field to display the value from the database, the field is blank.
2. Can't test it yet but I deviated from the tutorial for "Adding DFP to DataAssist Insert & Update Pages" by adding the field from the recordset in the Default file value (as described in showthread.php?t=25250) instead of the field from the WADAUpdateForm as described in the tutorial.
Is this correct in order to leave the image details unchanged if the update is only to the other text fields.