Both "upload" and "putObject" are methods for uploading files to Amazon S3 (Simple Storage Service), but there are some differences between them.
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"upload": This is a method provided by the AWS SDK for uploading files to S3. It is a higher-level method that abstracts away some of the details of the S3 API. With this method, you can upload a file from your local machine to S3 using just one command. The SDK handles all the details of the upload, such as setting up the necessary headers, sending the data, and handling any errors that might occur. The "upload" method is a simpler and more convenient way to upload files to S3.
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"putObject": This is a lower-level method provided by the S3 API for uploading files to S3. With this method, you have more control over the details of the upload. You need to specify the name of the bucket and the key (i.e., the path and filename within the bucket) where you want to upload the file, as well as the data you want to upload. You also need to set the content type, content length, and any other headers that are required. The "putObject" method is more flexible and allows you to customize the upload process to a greater extent.
tl;dr, "upload" is a higher-level method provided by the AWS SDK that abstracts away some of the details of the S3 API, while "putObject" is a lower-level method provided by the S3 API that gives you more control over the upload process.
