Editing PDF’s on ipad.... images?

It was asked a looong time ago on here, but the editing has improved over time for the text etc.  

We make ID cards, so have a PDF template setup, then just replace "name here" text etc.

But we'd love to replace an image? On the template i have an image in the file and on PC i just replace image and job done the ID is done, thats the ONLY bit i cant do on my ipad.  

Or am i missing something?