how can I take a pic of a photo with my external; camera

bigdrag wrote:

if I hold up a photo can I take a phot with the external camera

Yes. The Camera app can take a photo of most anything, including a photo of another photo.

There is also built-in scanning: How to scan documents on your iPhone or iPad - Apple Support

The built-in scanning can also scan photos.

bigdrag wrote:

Thanks but how do I snap the picture>. I can't seem to find a "trigger" or button to push to take a Pic.

Here are some: iPhone camera basics - Apple Support

The button shown on the iPhone display (circled) is commonly used, though the volume buttons (arrows) also work.