Image Upload

Hello, I'm creating a classified listing. I want to upload an image for the classified ad once I create the actual ad.

Does the image import "intelliwarp" have to be in a Edit or Show record screen? Are there any examples for this?

Basically I want to go to an "add new" screen, include the image upload button w/ image preview. Once all fields are filed out- save the classified ad and display it with a thumbnail and then inside the details of the ad show the full image. All the examples I see are for edit screens.