In your haste to send an email, have you ever forgotten to include your attachment? It happens, which is why the app is automatically set to remind you if it detects words like "attached" or "attachment" in your email, but forgot to attach any files. If you wish to disable this function, here's how:
1. Tap the Nav icon at the top left corner of the Nav Bar to display the Navigation Drawer.
2. Tap the Gear icon at the bottom of the Navigation Drawer to bring up Settings.
3. Tap Mail.
4. Under the Compose section, tap the Auto-detect missing attachment box to disable this feature.