RE: Can CRM OOTB send bulk email with attachment
Hi partner,
Yes, we can send bulk email with attachment in these 3 ways.
When create the email template, we can add the attachments on it.

It is at the bottom of the email body, and you need to stretch the browser window to see it.
Then when you would Send Direct Email or Quick Campaign, you must select the email template, you need to select the one with the attachments and send it, then recipients will receive the attachments.