Client or partner logos in a horizontal carousel — the classic “our clients” strip. Logos are set at Settings → Responsive Logo Slideshow, ten slots, each taking an image URL, an optional link and optional alt text.
The carousel
[logo_slideshow]
Notes
The shortcode takes no options — everything comes from the settings page. Upload logos to the Media Library first, then paste each image URL into a slot.
Both URLs must start with http:// or https://. A bare domain like ost.agency is rejected and saved blank, which looks like the setting did not save.
If every logo fits across the screen the arrows are greyed out and nothing slides — that is correct, not a fault. You need enough logos to overflow the width before it moves. With no logos configured the shortcode outputs nothing at all.