To add new property, go to Estatik plugin >> Add new property.
Enter title of the listing and description. Then go to the bottom and check Basic info, Media and Address tabs:
To upload images, first upload it to Media > Library and select them. Also, you can drag and drop images to change their order in frontend.
To add video, please enter the code like displayed on screenshot.
Do not forget to Publish or Save draft before closing the page.