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I think the “Dynamically” is missleading here. The documentation https://aws.amazon.com/about-aws/whats-new/2020/06/amazon-fsx-for-windows-file-server-now-enables-you-to-grow-storage-scale-performance-on-file-system/ refers to the hability of resizing the file system, whilst the questions refers to the hability of auto scaling the file system size.
After re-reading the question, the explanation is correct.
