No clues about email's attachments for any submissions

Describe the issue or problem
I’d like to check if a sent email had an attachment or not. It’s not verifiable in the Activity Log nor in the email_log table in the database.

Steps I took leading up to the issue
I looked at email_log table in db but I didn’t found any relevant information about attachments. To be honest I don’t know what event_type and assoc_type columns are for, but I don’t think they were related to attachments.

What application are you using?
OJS 3.3.0-6

Am I blind at all or is it an information stored nowhere?
Thank you in advance.