Hi,@milo last
Thanks for posting your question in the Microsoft Q&A forum.
According to your description, do you want to view the details of all emails with attachments?
Currently the mail flow cannot meet your requirements, but you can view all mails with attachments through content search.
Create a content search in Microsoft Purview.
The search results are as follows:
If you want to achieve the functions you expect, it is recommended that you use the Graph API.
If my answer is helpful to you, please mark it as the answer so that other users can refer to it. Thank you for your support and understanding.