If you want to add a Background Photo to your LinkedIn profile then read on:
The background photo is what is seen on the top section of your Linkedin profile. If you are planning to edit your background photo from your mobile then know that it is possible to do so as you would need to do it from the desktop only.
Open your linkedIn homepage by logging in and then click on the Me icon found at the top of the homepage.
Then click on View profile.
On the top of your profile find Update background photo and click on it. Then upload an image by selecting an image from your computer.
Now, click on Upload photo and click on Save.