No send button on Android app

No send button on Android app

I provide websites and web services for small businesses. I just set up a client with Zoho mail, to test out your services. When composing a new e-mail, the Zoho Mail Android app on his phone (Samsung Galaxy S7) does not show all the buttons on the toolbar. The responsive design hides all the icons.

After playing around with it, I discovered that the buttons to appear if he turns the phone in landscape. He finds it to be a pretty annoying inconvenience.

Just wanted to point this out so maybe you can make the send button more prominent (floating action button?, or always pinned in toolbar?)

Thank you