When I was creating a customer web service, I missed the functionality that offers in the application studio to perform the download WSDL file by own application in the solution cloud and not only in SAP Application Studio, so just to share this experience, follow below how to providing then:
After that you create a Custom Web Service your “Solution Explorer” stay like that:
To provide this web service just create a object:
Your “Solution Explorer” will be refreshed as the follow image:
After create a communication scenario, this scenario will be available in the Cloud Solution (from the “Communication Arrangements” Work Center), like that:
Well this is just an example.