All dropshippers will be added within ecomdash as warehouses, not suppliers because ecomdash treats dropship suppliers essentially as extensions of your warehouse options.
Ecomdash has the ability to pull inventory feeds from dropshippers as well as send orders placed on your storefronts to the dropshipper for fulfillment. Once the order has been fulfilled, the dropshipper can send back carrier and tracking information.
Inventory and order feeds can be communicated using FTP, SFTP, HTTP, or email. Tracking and carrier information can been communicated through FTP, SFTP, or HTTP.
To add a dropshipper, go to Settings > Warehouse Setup and click "Add New".