You can add your logo as an Email Signature for Gmail on an Android device by following these steps below:
- Open the Gmail app
- In the top left, tap Menu
- Scroll to the bottom, then tap Settings
- Choose the Google Account where you want to add a signature
- Select Mobile Signature
- Enter the text for your signature
- Tap OK
You may find more details on the Gmail Help Center Article.
For further information or to speak to one of our Support Agents, simply click on the link here and submit your message via the green Help button on the bottom right-hand corner.