The gallery notice type displays groups of images in amazing slider galleries.

3. A pop-up will appear that allows you to select images from your library, or upload new images.

4. Once you have selected your desired images, hit the 'Add to gallery' button.

5. Complete the other general steps to publish your notice - App Category, App Options & Publish.
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After clicking Create Gallery, you also have the option to caption your images, as well as drag them around to rearrange them.