Download a Document from s3 using webservice call

 We are trying to integrate appian with an internal Java application . The design is going on .   The Java application is responsible for connecting to s3 and providing us the document using a webservice call . We will call the API provided by Java application with a document ID . we will get the document as result of this call . we should be able to download the document to our desktop 

Please let me know if anyone worked on this type of requirements . I would like to know whether this is even possible with Appian 

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