Task attachment does not trigger approval workflow

Hi,

I configured a task of a Journey with the possibility to add an attachment for the assignee. 

The Document Type used in the task configuration requires Approval, but when the user adds the attachment, the document is uploaded without trigger the Approval Workflow.

If the user performs the same activity manually, the approval workflow is correctly triggered.

The expectation is that also when the document is uploaded trough the Attachment section into the task, the approval workflow is triggered because the document type uploaded requires the approval.

Do you know how I can achieve this behaviour?

Thanks,

Maurizio