Issue with composing new email

Its a very unique app for email client. I gave it a try and I noticed that email message got cut out when adding attachment, text composition box wont scroll and only signature texts are visible and sent! Whatever that I have written in the beginning were gone. The recipient only received the attachment and nothing else of the message composed in the txt body, except signature at the bottom. I think this is some seriously problem! I use iPhone 6 Plus, and iOS is the latest 9.3.1.

azulprints about Swingmail -Email App for iCloud, Gmail, Twitter DM, v9.0.0