Using Outlook for iOS for personal email and calendar management
I was having the same issue with my iPhone The way below is worked for me.
- Open a google docs on google drive
- Add your image in that file
- Adjust image and details on your signature
- Copy the final version of your signature or send it as link to your iPhone then open from iPhone and copy it and Paste into your signature in mail settings iPhone
Please feedback me to know if it worked for you or not.
You are the coolest person in the internet today (and probably a year ago), because your workaround just... works! Thank you!