Hi Nirmal, I was searching for the same functionality when I found your post and after some work got the email action to work!
I have an application that allows users to attach an essay to their application so in my case I have the application and the essay. My application and essay are saved together into a folder within my Repository (example: \LF Repository\Application\lastname_firstname).
Every application I save in this format (example): "Application - lastname_firstname"
Every essay I save in this format (example): "Essay - lastname_firstname"
Here is my workflow and below I will explain the actions:

1. Retrieve Laserfiche Forms Content:
Here I am only calling Application Date (a date field), First Name, Last Name
2. Find Application:
I am using Find Entry at: \LF Repository\Application\lastname%_firstname%\Application - lastname%_firstname%
NOTE: Items with "%" are variables from the first action - retrieve LF Form Content
2. Find Essay:
I am using Find Entry at: \LF Repository\Application\lastname%_firstname%\Essay - lastname%_firstname%
NOTE: Items with "%" are variables from the first action - retrieve LF Form Content
3. E-mail Action:
I am attaching the files from the Find Action Outputs, this way when Find finds those files, it attaches them. Then the person who receives the email will get a zip file (because there are two) with PDF application and form.
Hope that helps! Let me know if you have any questions :)
LB