To submit the selected bulk action on the selected products

1. Go to the Magento 2 Admin panel.
2. On the left navigation bar, click the SELLERCENTER INTEGRATION Menu.
   The menu appears as shown in the figure:
   
3. Click on Manage Products.
   The Manage Product page appears as shown below:
   
4. To upload the selected products, do the following steps:
   1. Select the check boxes associated with the required products.
   2. In the Actions list, click the arrow button.
      A list appears as shown in the figure:
      
   3. Click Upload Products.
      A confirmation dialog box appears.
   4. Click the OK button.
      The selected products are uploaded and a success message appears on the page.
5. To update the selected products, do the following steps:
   1. Select the check boxes associated with the required products.
   2. In the Actions list, click the arrow button.
      A list appears as shown in the figure:
      
   3. Click Update Products.
      A confirmation dialog box appears.
   4. Click the OK button.
      The selected products are updated and a success message appears on the page.
6. To Update Images do the following steps:
   1. Select the check boxes associated with the required products.
   2. In the Actions list, click the arrow button.
      A list appears as shown in the figure:
      
   3. Click Update Images.
      A confirmation dialog box appears.
   4. Click the OK button.
      The selected Images are uploaded and a success message appears on the page.