Choosing a document management system?

Question

Document flow

Hello!

Advise the workflow system for such a "TK":
1. Number of users - min 5 people;
2. Exchange (synchronization) with several EDF operators (Counter Diadoc, Sbis);
3. Automatic digitization of documents received by the Foundation through EDI;
4. Ability to differentiate access rights for users;
5. Possibility of remote access to storage;
6. Ability to download / edit / delete documents stored in the repository.

Answer 1

Everything is "simple". You hire a developer who, according to this TOR, will write a workflow system.
Although it is not clear why something else, if you already have to use Diadoc, Sbis.
It makes sense to clearly formulate what does not suit simply Diadoc, what does not suit simply Sbis, etc.