how to edit the cors configuration for Cross-Origin Resources Sharing in Amazon

I want to change the setting in EasySocial -> Storage -> Storage Paths -> Audio

I want to select Amazon S3 instead of Local Server for the Audio files storage.

I am assuming this will allow Amazon to store and serve the audio files?

You have a link for how to allow Cross-Origen Resources Sharing in Amazon which is located here: https://docs.aws.amazon.com/AmazonS3/latest/user-guide/add-cors-configuration.html

I have followed the instructions but still have some questions.

1) Should I be setting these permissions on the root level of this bucket?

In my case I have a bucket called drcarney where we are storing the files for drcarney.com
Is the top level folder which I have named drcarney the one where I should set these permissions or should I be setting them ina a child folder?
Here is the folders as they appear now: drcarney->media->com_easysocial->avatars, cache, files, photos, videos

I am assuming I should be doing this at the top level and so setting the permission on the drcarney folder?

2) There is sample CORS configuration and I am wondering if I am just supposed to save that configuration and if it will work or are there some special entries I need to make in this file. The same entry is as follows:

<!-- Sample policy -->

<CORSConfiguration>

	<CORSRule>

		<AllowedOrigin>*</AllowedOrigin>

		<AllowedMethod>GET</AllowedMethod>

		<MaxAgeSeconds>3000</MaxAgeSeconds>

		<AllowedHeader>Authorization</AllowedHeader>

	</CORSRule>

</CORSConfiguration>

Thanks for any help you can give me here.

Sean