In normal mail replies the attachment is to be seen. But in conversations, when mails are bundled with header"Me,…" they disappear and can not be got any longer
You will find all the individual messages listed in the message panel, either above or below the one you are currently viewing.
Scrolling up or down will enable you to see those messages, and the ones that have attachments.
Clicking on that message will enable you to access the message and it’s attachments.