Assets can be uploaded to the project by the user himself or can be requested from the different users.
To upload an asset, the user should open the project screen and navigate to the Assets tab.
Next, hit Upload File and pick one on the computer. Click open to upload.
To request upload from different user click on the Request button. Set due date and add a description if needed. Check one more user to assign the task to.
The assigned user will get a task on his dashboard promoting to upload the asset and complete the task.