Yes i have the latest acrobat reader dc.
I would like to specify my request more precisely.
I'm creating an interactive pdf for car dealers. See attached picture.
The dealer will write a text box and choose a car picture at the end of the pdf.
The dealer must select a photo from his computer and put it in pdf.

It looks like you're using Acrobat, so you will be able to add image fields like try67 suggested. Image fields are nothing more than regular buttons with a Layout other than "Label only". Adobe recently added functionality to Reader so that users can select common image formats (JPEG, GIF, TIFF, BMP). Before that, Reader 11 could only import images from PDFs, and before that, it could not import images, unless you go back to versions 3 and 4 (but it couldn't save back then, just submit).
The functionality is implemented with the field.buttonImportIcon method, so the Mouse Up script can simply be:
// Mouse Up script for a button
event.target.buttonImportIcon();