Hi @lee sharepoint,
I would recommend you to use react-adaptive-cards-image-gallery. Adaptive cards are great fit for Bot, however they can be effectively used with SPFx to render the content. This web part helps to display the image gallery from SharePoint list.You could refer to following document
https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/react-adaptive-cards-image-gallery
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