Three Different Deliveries
If an Amazon delivery driver caused your collision, the first question is not a legal one. It is factual: which kind of Amazon delivery was it?
A branded van running a fixed route is generally operated by a contracted local delivery business, not by Amazon directly. That business owns or leases the vans, employs the drivers, and carries the insurance.
An app-based driver delivering in a private car is a different arrangement again — an individual using a personal vehicle and, ordinarily, a personal auto policy that may or may not respond to a loss occurring during commercial delivery work.
Freight moving into and between Amazon facilities is a third category, closer to conventional trucking, and can involve carriers with no visible Amazon connection at all.
One brand, three structures, three different answers about who is responsible and what insurance exists. The vehicle at the roadside frequently does not tell you which one you are in.

