Creating a new Folder
If you already have uploaded the images that you would like to display in your Gallery, you can arrange them into a folder in the Photos and Media Manager. Simply click the "MEDIA" button in the main toolbar to open the Photos and Media manager and can create a new folder in the bottom left-hand side by clicking "Add New Folder". You can then drag and drop images into this folder (for more information on managing folders, please see the File Folders wiki).
Selecting a Folder to Display Images
If you would like to create a new folder and upload images from your computer, this can be managed from the Gallery. Simply navigate to your Gallery and click the cogwheel to see more menu options, from here go to "Images". Click "Upload Images" to select your folder from the drop-down menu or click "New Folder" to create a new one. In step 2, click the “Drop files to upload” region to upload files from your computer, or you can simply drag and drop files into this region.