Please follow the below steps -

Step 1 : Login to your eShipz Dashboard

Step 2 : Click on Settings > Click on Sales channel 

Step 3 : Next click on Amazon > Click on What do I upload here to understand what file to upload or go to amazon seller central and download unshipped orders file from orders report and then upload the file here as shown below -

Step 4 : All your orders are now imported to eShipz.