non callback version of createPresignedPost is failling randomly when using IAM roles credentials

[rawpixel-vincent]

You know it's preferable to use the asynchronous method when you use the IAM credentials.

No I didn't know, the issue only happened randomly, wasn't catched when testing, caused issues in production environment.

If the non-callback method doesn't work, would it be better to remove it? (or at least marking it as deprecated with an explanation)

Originally posted by @AllanZhengYP in aws/aws-sdk-js#1756 (comment)

[peterwoodworth]

How did this get posted as an issue here with no labels?

[github-actions]

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