Hello,
Thank you for reaching back and confirming.
When the documents are less the 5 MB they are usually attached as separate PDFs, however, when they are bigger than 5 MB they are either combined or not attached at all, unfortunately, this is something that can not be changed: https://support.docusign.com/s/articles/Why-are-documents-not-attached-to-the-Completed-email-notification
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Best regards,
Nathaly | DocuSign Community Moderator