Multipart uploads must be used when uploading files larger than 5 GB to Amazon S3, as this method splits the file into smaller parts for parallel upload, improving reliability and performance. The WGU Cloud Deployment and Operations Study Guide (Section 2.1, S3 Uploads) states, "For files exceeding 5 GB, multipart upload is required in S3, allowing the file to be divided into parts (minimum 5 MB each) for concurrent uploads, ensuring efficient and resumable transfers." Glacier Select, Transfer Acceleration, and Intelligent-Tiering are not designed for this upload optimization.
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