Almost any file of document can be stored and attached. Popular file types like PDF, JPEG, TIFF as well as Office document types like Word, Excel and PowerPoint are natively supported.
Almost all SAP transactions are supported. Any Business Object in Business Suite which has support for ArchiveLink is supported. Even for custom transactions/Business Objects, SmartDocs enablement is quite simple.
No. SmartDocs application which resides in Google Cloud does not make any calls to your SAP ECC system. Only our ABAP add-on makes out bound http calls to our cloud APIs.