Mail; attachments as icons - not full page previews ...

Hi - I'm on an iMac, OS Sonoma. In email replies to my senders, where I need to attach files, it seems that they always get inserted as full previews of the file - like when I attach a pdf, it will display the whole first page, and nearly as large as the original. I'd like to have my files show as little icons - I don't want to waste space in the email with such large images. If I have multiple files, they all display this way in the body of the email.

I'm sure there's a setting somewhere for this, but I can't find it. any suggestions will be greatly appreciated.