[Enhancement] Add More Files - Remove option 

Scenario:
When you select Add More for > Upload File - There is no way to remove the Add more option
      

> Steps:
>       - Click Subscribe2 from Left Nav
>       - Click Send Email Menu option
>       - Click > Add more File

Suggestion:
Add a remove option

Screenshot for reference:
https://www.awesomescreenshot.com/video/13240279?key=8d604af8ab0b05b559737dbb9ef81ca5