docs: Fixed README credentials and usage sections#15

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chloe1818 wants to merge 3 commits intomainfrom

Commits on Jul 31, 2025

Fixed README to use aws-region when configuring credentials and clarified usage section description.
wuychloe@amazon.com chloe1818
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Updated function create unit test.
wuychloe@amazon.com chloe1818
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Commits on Aug 1, 2025

Removed unit test that tests S3 key with timestamp.
wuychloe@amazon.com chloe1818
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