We have Multi-item Cart enabled (Global Settings → Booking settings), and it works correctly in one entry path but not another — same setting, same listings, inconsistent behavior depending on how the customer arrived.

Steps to reproduce:

Enable Multi-item Cart.

Get a listing's individual Scheduling Link via the "..." menu on that listing row (format: /rentals/{account}/rl/{slug}).

Visit that link directly, select dates, click Add to Cart. On the resulting Booking Summary page, there is no "+Add More Listings" button — only "Continue to Checkout."

Now compare: get a Category shareable link instead (format: /rentals/{account}/rc/{categoryId}), browse to the same listing from there, add it to cart. On this Booking Summary page, "+Add More Listings" is present and works as expected — customer can browse and add additional listings to the same cart/checkout.

Same account, same Multi-item Cart setting, same listing — the only variable is which link type the customer entered through.

Why this matters:

A listing's own Scheduling Link is the most natural way to link directly to a specific package — from a pricing page, an ad, a marketing email, anywhere you want "click here to book this exact thing." That's likely the single most common real-world entry point for a rental business, more common than sending customers to a general category browse page. Having Multi-item Cart silently unavailable specifically on that path undercuts the feature for what's probably its primary use case — a customer who books one item via a direct link has no way to add a second item (an add-on, a piece of equipment) to the same checkout, even though the setting says they should be able to.

Ask: Multi-item Cart should behave consistently regardless of entry point. Either fix the direct Scheduling Link flow to include "+Add More Listings" the same way the category link flow does, or — if this is intentional — document the distinction clearly, since nothing in the current Rentals help articles mentions it.