[gardenweed]

Unfortunately you cannot use the Android Share feature to send a photo via the FM App. The App doesn't support this.
Instead you need to open the FM App and enter the Compose screen, then use the Attach File button and navigate to the Gallery.

Alternatively you can download an App such as Windows Outlook and setup your account in this as well.
When you want to use the Share functionality on Android, you can direct it to use the Outlook App to send the email (instead of the FM App).

Edit - corrected name of windows email app