When exporting a form with images embedded in it, the export file format (pdf, csv, xml, etc.) will dictate whether the images will display. A pdf can display an image but a csv or xml file cannot. It displays the image in a binary hex (0 and 1) format. If you want to be able to view the images contained in these type of files, do the following.
Turn “Embed images as data for csv and xml” to “ON” which will convert these images into jpegs.