Hi all,
Notes and any email attachment is stored in single entity called annotation.
and if you set the max length for attachment in setting
The same size restriction is set on CRM OOB notes (entity) and email attachment both.
for setting up the limit you can go to setting > Administration > System Setting > Email Tab > Scroll down and find set file size limit for attachment.
This file size limit is set for all attachment in system.
Check this blog for more detail.
https://www.adoxio.com/blogs/team/Dynamics-CRM-Attachment-Size-Limit-Increase/