Which link should I use in my ads while a test is running? (Essential CRO Split AB Testing app)

Use your normal store URL, the same one you'd use without a test. For example, your home page or the product page you're testing.

The app splits visitors after they land:

• Template test: the app assigns the visitor to A or B. Visitors in B are sent to the same page with ?view= and the template name added to the URL.
• Theme test: the app assigns the visitor to A or B and loads the assigned theme.

Your campaign parameters, such as utm_ parameters and fbclid, are kept during this redirect.

Don't use a preview link (one with preview_theme_id or eaPreview=true) in ads. Preview links are only for checking a version yourself.