As of March 2025, Microsoft introduced a new feature in Dynamics 365's enhanced email attachment control: the "Attach from previous email" button. This allows users to reuse attachments from prior emails within the system, streamlining workflows.

Currently, Microsoft does not provide a built-in option to disable or customize this specific button.

The downside of this control is that it displays all attachments that the end user has received - It is not locked down to only show associated attachments to the current case/record.

This ask is to let developers select if this control enables to add any attachments or to only show attachments related to the current case/record. If this is not permitted only show attachments related to the current case/record then.