Hello,
At the moment it is only possible to have multiple images by uploading them with the “Add Media” button and make the images basically “attachments” for the specific listing. On the other side you would then need a gallery plugin to display them.
As an alternative: Our premium themes feature their own listing galleries, where you can straight upload multiple images through a dedicated listing image metabox and get them displayed through a widget.
Hope I could help a little bit.
All the best
