They started with a review of my work history, then asked what drew me to Amazon, then a series of STAR (Situation, Task, Action, Result) questions mapping to the Amazon leadership principles.
My advice is to review the Leadership Principles (found here: https://www.aboutamazon.com/about-us/leadership-principles ) and determine which are most relevant to the role you're interviewing for. Then write out STAR structured answers to "Tell me about a time when..." (you overcame a communication challenge at work, disagreed with a supervisor, helped mediate a dispute between people you manage, etc..) using those Leadership principles as a core theme.