If you find that some products are out of stock when uploading products on Shopee, you can take the following steps:

Set inventory limits: On Shopee, you can set inventory limits for each product. Once the inventory is zero, the product cannot be sold. Therefore, you can set the inventory quantity on the product details page to avoid running out of stock.

Check inventory regularly: Check your inventory regularly to make sure you have enough product quantities. If your inventory is low, you can avoid losses by re-adjusting prices or increasing inventory.

Set automatic replenishment: Shopee provides an automatic replenishment feature that automatically replenishes stocks based on your sales data. If you are using Shopee's supply chain services, you can work with Shopee to get more accurate sales forecasts and automatic replenishment features.