I have a pdf with 110 fields. It works with 109 fields. As soon as I try to display an image inside the pdf it gives me an error. The pdf can not be created.
Try creating another field map layout using the same Formidable Form, a new PDF form with just one text field, and only merge the image and let us know if it works.
If the above works, try removing one field from the field map layout so you only have 108 fields, then add the image field to the mapping, if it works you’ll need to increase some PHP settings.