Gmail keeps your mobile signatures on Google’s servers, and the Gmail app pulls them in whenever you send a message. When you hit the Save Signature button, Email Signature Generator by cloudHQ stores them for you.

For aliases though, cloudHQ sometimes can’t save the signature.

When the Google API blocks the save, you still have the option to add the signature by hand in Gmail on the web. Follow these steps:

1. Start by copying your signature to the clipboard.
   
2. Go to https://mail.google.com/ and open Gmail in your browser.
3. Now open the Gmail settings. Click the gear icon Settings in the top right corner, then click See all settings. This brings up the General tab.

   

4. Scroll down until you reach the Signature section.
5. Pick Show native Gmail signature editor. Gmail’s own editor shows up under those two options.

   

6. Click Create new.
   
7. Type your Gmail alias as the signature name, for example alias_email_address@gmail.com, then click Create.
   
8. Paste in the signature you copied earlier.
9. Choose your Gmail alias from the dropdown menu:
   
10. Choose the signature name you set in step 7.
    
11. Scroll down and click Save.
12. To check it on your phone, open the Gmail app and send an email from your alias, for example alias_email_address@gmail.com.