Case comments with attachments

Salesforce case comments does not allow sending attachments what is the best possible way to do that in classic without APEX
Sending emails from Email related list is one option but that does not auto create case comments.
Firing off an process on Email Message Object to a Flow enables me to create a comment but it picks HTML code along with the message instead of a plain text.
If any one have dealt with this earlier, any pointers would be helpful.