This page prescribes how to save and upload AusPost Proof of Delivery to Shopify
Steps:
Search the order# on BQ Shopify and copy the AusPost Tracking number
Go to SAP (eParcel Track) and input the tracking number in the Article ID box.
Scroll down under Event Messages and look for the Delivered status. Click the Signatory Name to open the file.
Click the download icon and save the file (e.g. BQ Order# POD)
Go to the Shopify order page and click the attach icon under Timeline
Complete the upload.