Learn about Microsoft Dynamics CRM Power Platform customization and implementation and other cool stuffs
most of the website allow users to download publicly available document from there website, in PowerApp portal there isn't any straight solution. but we can achieve it by a simple trick
PowerApps Portals is now available for Public Preview
I looked online but didn't find any solution, since its a customer type field, data can be from either of the entity, so adding new data source solution doesn't quit work, all it needed is little tweak.
D CRM Explorer 