If you are using an Amazon S3 bucket to store data, you may be wondering if the bucket can generate its own object key names. The answer is yes, the bucket can generate its own object key names, but it is not recommended.
When you create a new object in an Amazon S3 bucket, you must specify a key name for the object. The key name is the unique identifier for the object in the bucket. If you do not specify a key name, Amazon S3 will generate a key name for the object.
The problem with letting Amazon S3 generate the key name for an object is that the key name may not be unique. If two objects in the same bucket have the same key name, only one of the objects will be accessible.
It is recommended that you always specify a key name for your Amazon S3 objects. This will ensure that the objects in your bucket are always uniquely identified.