When to use it
Use it at the end of an explanation, a presentation, or a set of instructions. “Does that make sense?” invites a polite yes. “What questions do you have?” assumes questions are normal, so people actually ask them, and you find gaps before they become mistakes.
Example
You: “So that's the new approval flow. What questions do you have?”
Teammate: “Who approves when you're out?”
You: “Good question. Priya covers for me.”
In an email or Slack message
In email, close with “Happy to answer any questions. The part people usually ask about is the approval step.” Pointing to the likely question makes it easier for readers to raise it.