Can't add products to product grid unless they're on the same page
Hello, I'm trying to add products to this product grid for an email. However, when selecting products from our Shopify list, I can only add products as long as they're all in the same 'page'. If I search for a product, or go to the next page, it removes the selected items from the 'Selected Products' tab.
Also, if I add products to the email, and try to add more, unless the products I already selected are in the visible page, when I click 'Add Products', it just removes them from the grid. Here's some screenshots.
Selected four items. 'Selected Products' now says 4:

Went to page 2. This deselected all my items. If I click 'Add Products', no products get added, even though I just added four items from the previous page:

