Hi,
No there is no other option.
The files are not attached to the email notifications on purpose as in most cases, you want to avoid doing that.
Big files will cause issues with the sending of emails (flagged as spam, email rejection as it's too big, sending takes too long, etc).
So we opted to instead only include a download link to the email.
Now if you want to do that, because your files are small, the only solution left will be to do some custom development to attach the files in the emails instead of providing a link. It's should be possible with a bit of code customization in the "preload" section of your emails via the menu System>Emails. A skilled PHP developer should be able to do that for you in a few hours.