Check Walmart Uploads
This step is where you verify the batches on new products that you uploaded in Step 4. You will be required to verify each batch as you will not be able to update inventory or pricing for products that do not have their batches verified. Simply click on the batch id, date, or verified "no" link to verify a batch. Clicking the reset button for any batch will reset the products to upload. Since there is no mapping process, all of your products that are not on Walmart will be reset to upload based on the filters in Step 1.
You can also see the uploads of feeds that have errors within the Walmart Interface by going into the Feeds section, and clicking on either Item, Inventory, or Price. The most common errors for Walmart are products that are missing UPC codes and invalid image urls.