How to upload a document in a process and not on a task?

While adding a  document on a task we get operations but while creating an instantiation form we don't have operations
So how to attach a document in an instatiation form?

Hi
You can use a contract input of type FILE (it can be created automatically when using add from data... in the process contract property section).

A form can also be generated from the contract to have the proper upload widget configuration for a given FILE input.

HTH
Romain

As I want to create a evidence on process I created a contract input .and not able to create operations 
So what about operarions? Do I need operations for it?

Is evidence a document ?

Documents can be mapped directly to FILE contract input (without needing an operation)