picture viewing

ChloeDachshund wrote:

H/ow do I view pictures off a sd card in slideshow mode

Are they in your Photo.app.....(?)

Have you created an album...(?)

Create slideshows in Photos on Mac - Apple Support

or

Are they in a folder on your Desktop or some such,

Preview.app> Help>slideshow

ref: https://support.apple.com/guide/preview/display-pdfs-or-image-files-as-a-slideshow-prvw3b268798/11.0/mac/11.0