HI,
1) Create the items, go to Portfolio > Add new. Add a title, featured image, second featured image(upload a GIF), category. Refer to:
https://doc.seatheme.net/theme/art/portfolio/single-portfolio/
Add the video: https://doc.seatheme.net/theme/art/portfolio/single-portfolio-thumbnail-video/
2) Create the Gird: go to Page > Add new, add a title, click BM content builder, add a Grid, choose the category of the portfolios (video items). Click “Advanced settings”, Select “Lightbox” for “What Thumbnail Does” selector
Regards!
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