Final answer:
The recommendation for multi-part upload in Amazon S3 is to use multi-part uploads for large files, typically over 100 MB.
Step-by-step explanation:
The recommendation for multi-part upload in Amazon S3 is to use multi-part uploads for large files, typically over 100 MB. This is because larger files can be difficult to upload in a single request and can lead to timeouts or failures. Multi-part uploads allow a file to be divided into smaller parts, which can be uploaded independently and in parallel, increasing the speed and reliability of the upload process.