How to Set a Poster Image for a Gallery Video
A poster image is the picture that shows for a video in your gallery before it plays, and MetaSlider Gallery lets you pick your own for each video. You do not always have to set one. If the video has its own cover art, the gallery uses that. If it does not, the editor takes a frame from the video when you add it and saves it to your Media Library as the poster. You can replace either with an image of your choice at any time.
How to Choose a Poster Image
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Open your gallery in the editor. If it opens in preview, click 'Arrange' above the images so you can see each video tile.
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Click the 'Poster' button on the video tile.
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In the Media Library, select the image you want to use and click 'Use as poster'. The video tile updates to show your new poster.
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Click 'Save Gallery'.
To go back to the video's own poster, click the small × next to the 'Poster' button and save your gallery. The poster you choose applies to this gallery only, so the same video can show a different poster in another gallery.
Your video now shows the poster image you chose until a visitor plays it.