As per the description given above, I believe you are willing to share your documents with a company and make them available to download? The title of this discussion is quite confusing. Are you willing to remove anything from the cloud too?
For the first scenario, you can upload a document to the cloud or Document Cloud>select Share File>Get a Link or Invite People by email. You can make the document available for download and share the link with whoever you want to let your document accessible.