Hi there @AK7,
Welcome to the Community!
Abandoned Cart SMS messages are a little different from emails.
Adding a link to your SMS Flow would be setup within the flow itself. You can populate a dynamic cart link in your SMS abandonment flow the same way you would for email. For a Shopify integration, the tag {{ event.extra.responsive_checkout_url }} should populate the dynamic link for a flow triggered by the Checkout Started event. When using a link shortener, this dynamic link will be shortened in the final send.
In an email, you can reflect every item the customer abandoned at checkout. In an SMS message, you can only show one dynamic image. So, you can add in the image of the first item in the event data by replacing the dynamic image placeholder you have with this dynamic event variable here: {{ event.Items.0.FirstImageURL }}
Note, I found this dynamic event variable in the event data showing in the right-hand panel (preview event info).
Once added, we can see an image of one of the products the customer abandoned:
Learn more here:
How to Add SMS Messages to Your Abandoned Cart Flow
How to Add a Dynamic Image to a Text Message
Thanks,
Alex