How to upload youtube channel art on mobile
Step 1. Go to any web browser and open youtube.com.
Step 2. Now click on the three dots showing at the top right side of webpage.
Step 3. You will find a desktop mode option there. Click on it.
Step 4. After clicking on the desktop mode option now click on your channel logo showing at the top right side of webpage.
Step 5. Now you can edit the channel art of your channel.