Example: A business card has variable logos where the selection occurs on the order form while the EZMerge 'Logo' field is hidden.

When using Advanced Auto-Fill to select variable data such as logos on an EZMerge document, if the field is hidden within the EZMerge document then the proof preview will not automatically refresh. 

Open the 'Edit' view for the order form and locate your selection field that is using Advanced Auto-Fill. In this Advanced Auto-Fill Menu, you should have assigned values for passing information. In this example I used a Logo field so the syntax looks like this:

Select One...
BC1@=1@={udf_ez:Logo}=Logo1.pdf
BC2@=3@={udf_ez:Logo}=Logo2.pdf

By adding @={udf_ez::ezpage}=1 you can force the refresh and also change the page number. The syntax should now appear like this: 

Select One...
BC1@=1@={udf_ez:Logo}=Logo1.pdf@={udf_ez::ezpage}=1
BC2@=3@={udf_ez:Logo}=Logo2.pdf@={udf_ez::ezpage}=1

Once this is added, save all changes and switch back to 'View' to test the order form.