To add a new portfolio item go to Portfolio > Add New. Set a featured image from the panel on the right, fill in any text you have for the portfolio item and move to the Portfolio Details panel below. Please read thoroughly the Information tab. It contains useful info on how the gallery functions on single portfolio items and will help you get the layout you want. Next proceed to the Gallery tab, select a gallery layout and upload your images. Move to the Details tab and add details for your portfolio item, such as materials used, cost, equipment used etc. Finally, if you have a video for the portfolio item you can use it in the Video tab. Publish the portfolio item.