Thank you so much! I need a physical card insert included in the package. I do have the insert set as a product in my shop (just in draft mode). Would that affect the coding you provided?

Currently with all my orders I include inserts. I know that I need to customize/edit the packing slip template to include instructions for my fulfillment center to include the inserts. I am not technical, so I have no idea how to edit the liquid code...