We are planning to allow the users to attach documents from our HTML app. The Documents are stored in Enterprise Content Management system (ECM). The ECM system could be different for each client. The Question i have is, how do i edit the documents stored from an ECM system online from our app. The document attached would just show as a link. The document can be opened in a native software like Word, Excel but saving the document should directly save it to the ECM System. I don't want the user to download, change and upload again.
Any help would be greatly appreciated.