I am trying to create a popup with includes a image gallery and contact form, can I do this?
Generally speaking - yes. However, the devil is in the details.
The image gallery needs to be a 3rd party script that you need to adjust for Unbounce. Hosting the images externally. Adjusting any JS, etc.
You can put an Unbounce form in a lightbox if you don’t already have one on the landing page.