Beginners instructions for populating a Portfolio in Uncode

Hello! I would like to create Portfolio pages in Uncode using, for example, the Sidebar Gallery Full-Width, but I can’t seem to work out how to apply it. Also, (using the Creative Studio theme), I want to place my artworks into the Portfolio Preview block, but when I try to edit it in Visual Composer, I can’t work out how to place images into the boxes.