Need an extension to attach user manuals with order confirmation email

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my client sells irons, vacuum cleaner and other such electronic items. To use and operate, he requires to attach user manuals with order emails. is there any way i can attach user manual pdfs with order confirmation email sent to customers?

paid extension is preferable only if it has good reviews

[Meetanshi]

With Magento 2 Email Attachments, you can attach important documents, terms and conditions, policy documents, user manuals or any files with order emails. 

For the said requirement of attaching user manuals to the order confirmation email, you can fulfil it by using the said extension.