added a message

Author: zlik

app/code/Meta/Catalog/view/adminhtml/templates/system/config/product_feed.phtml

@@ -67,4 +67,6 @@
 </span>
 <p class="note">
     <span>Upload products from <?= $escaper->escapeHtml($block->getStoreNameForComment()) ?> to Meta</span>
+    <br/>
+    <span>Note: This action may not be suitable for extremely large catalogs.</span>
 </p>