Is it possible to have an action, which updates a column in table A, be the trigger for a workflow in its subtable B?

[1minManager]

I have an App where the user wants to get an email of all the data from 2 tables. The problem is that the Table B records contain a lot of files and photos. I want the action for each Reverse Referenced B Row to create an indiviual email. If they are go out in one email, it will probably be over 10MB