Question:

How do you add Task comments in Vault PromoMats?

Answer:

Task comments can be placed when completing a task. Within the Complete window, there is a clickable link to Add Comments.

Comments added in this way (called Task Comments) have a character limit of 500 characters. They can be accessed only from the Timeline, extending the workflow section in which they are placed.

Related Documentation:

Vault Help:  Accepting & Completing Document Workflow Tasks