When we forward an email message in Microsoft Outlook, original attachments in this email message are remained in the forwarded message. However, when we reply an email message, the original attachments will not be attached in the new reply message.

Does Forward in Outlook include attachment?

When you forward a message, the message includes any attachments that were included with the original message. Additional attachments can be added to the message. Attachments aren't included when you reply to a message. You can manually add attachments to any reply message.

Do forwarded emails include attachments?

In addition to forwarding emails, Gmail also enables its users to forward any attachments the original email included as well. ... Recipients of the forwarded attachment can open and view the attachment in the same manner as if you sent the attachment to them directly.