Officially Whatsapp supports uploading of media via API, getting Media Url from media Id and deleting the media. But the SDK as of now only supports the two features:

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Getting media Url from media Id

You can get the media Url from media Id using the getMediaUrl method available on the client class media manager. Here is an example of how you can get the media Url: 
	await whatsappClient.media.getUrl('mediaId')

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Deleting media

You can delete a media using the deleteMedia method available on the client class media manager. Here is an example of how you can delete the media: 
	await whatsappClient.media.delete('mediaId')