You can download a copy of invoice on BSDrophispping app in PDF format, just like steps below.
Log in to BSDropshipping app
Go to "Settings", go to "Billing", Input your personal or company information
Click on “Invoiced”, choose the orders, go to "Actions", click "Download Invoice"
Note:
If you have too many orders, you can scroll down the page and select the number of orders you want to include in your invoice. Currently, the BS app only supports a maximum of 1,000 orders per download.
If you want your invoice include the orders the time you received the on your shopify store or the time you added the orders to invoice on BS app, you can navigate to "Order", click the calendar icon, and choose the time period for your placed orders.
"Order time" refers to the time when your customer places an order on your Shopify store.
"Pay to BS time" refers to the time when you add the orders to invoice on the BSDropshipping app.
Then download the inovice you prefered.