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Custom Lightbox - Next/Prev Buttons?

Hi folks! Due to the lack of customization of the native webflow lightbox, I have setup a custom Lightbox according to “pixelgeek” on youtube.comHow to make a custom CMS lightbox from scratch in Webflow — Tutorial (2021) - YouTube

Now I’d also need a prev- and next photo button. Can anybody help me on coding this?

Thank you very much in advance!!!