Many different ways to do it.

Better may be to create a full page popup element. Set the background style to none. Set the data type to image but leave datasource empty.

Add a full page image element in the popup. Make sure to check the box for keep elements proportions, so that it will resize according to the image element ratios both vertically and horizontally as page width decreases. Set data source to parent groups image.

When click on an image in the slideshow do workflow. Show popup then display data in popup being current cells image.

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