Plus Size Pups review for Walmart Marketplace

I have spent hours on chats and email to try and figure out why this app will not upload all my new products. Gives me an error message that it's on the Walmart side yet on the phone with Walmart for about an hour and they never received the file. Did a test with a manual upload to Walmart with one new product and it worked. Just not auto from Shopify to Walmart. My older products update fine. Just can't get it to grab new ones.