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As always, "it depends". But I would draw it S3 -> Lambda -> API
because you're drawing the flow of information. If you wanted to be super clear, you would label the arrows S3 --Trigger--> Lambda --Calls--> API
and then because Lambda is retrieving the object from S3 you would put another arrow there between Lambda and a second S3 "object".
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A good reference would be UML Sequence Diagrams. In a system, the arrow represents the flow of events or data.
answered 2 years ago
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