Amazon calls a folder as a "bucket".
Use this field to create a new bucket in your S3 account. If you have already created one, then ignore this - no need to create one.
But if you are using S3MediaVault for the first time, you want to have at least one bucket (aka folder) in your S3 account, to which you can upload Videos, Audio, PDF, etc.
Naming rules:
* RECOMMENDED: Simply use your domain name as the name of your bucket, without the .com, or .net etc. So for eg., if your website domain name is yoursite.com, then just choose yoursite as your bucket name (all lower case, as one word).
* Must be all lower case, no special characters, no spaces
* Must be at least 3 and no more than 63 characters long
* Cannot contain uppercase characters or underscores
* Can have lowercase letters, numbers, and hyphens
* The bucket name has to be unique across ALL Amazon buckets. So if someone else has taken yoursite as the bucket name, you will have to choose a different one.