Impossible to copy&paste a file!

Impossible to copy&paste a file! When I want to write a new e-mail attaching a file from other mail, I used to copy and paste in Outlook. It seems to be impossible with EMClient. Please, I need help!!

Copy and paste work with latest version 7.1

Push the ESC key once.  Weird or not, the copy - paste function will work again.

Copy and paste seems to work just fine in the latest version 7.1.31849.