Fictional conversation. Illustration, not a Gmail screenshot or test result.

Conversation toolbar: Forward all applies to the whole thread.
  1. 1
    Quote for leaflet printing
  2. 2
    Order confirmation and internal note
  3. 3
    Invoice: invoice-leaflets.pdf

    Open this message. Its own More menu → Forward.

  4. 4
    Thanks for delivery
Fictional print-shop conversation: open the third message with the invoice and check recipients, files and quoted text before sending.