Your profile photo appears in the navigation bar and on your settings page.
Adding a photo
Go to Settings.
In Profile Information, click Select A New Photo.
Choose an image from your device.
Click Save.
Requirements
Format — JPG, JPEG, or PNG
Maximum size — 3 MB
Square images look best, since the photo is displayed as a circle. A rectangular image will be cropped to fit.
Removing your photo
Once a photo is set, a Remove Photo button appears. Removing it reverts to the default avatar showing your initials.
Common problems
Your file is rejected — check the format. HEIC photos from an iPhone are a frequent culprit; convert to JPG first, or change your iPhone camera setting to "Most Compatible" under Settings → Camera → Formats.
The file is too large — anything over 3 MB is refused. Most phone photos exceed this. Resize or compress it, or take a screenshot of the image and upload that instead, which is usually much smaller.
The old photo still shows — your browser has cached it. Refresh the page, or clear your cache if it persists.
If you use Google sign-in
Your Google profile photo is used automatically when you first sign in. You can replace it here at any time, and your choice will stick.