For images uploaded directly from the camera of your mobile device,
the image size may be too large (above 10MB). To reduce the file size before uploading,
follow these steps:
Go to Camera Settings by clicking on the gear icon in the top-right of the camera app.
Select "Picture Size" and change to a smaller size. This will reduce the overall file size of your photo.
While taking a photo with the camera app, click on the toolbar at the bottom of your screen
to select a smaller picture size. Choose a smaller option like "Square" or "4:3"
and this will reduce the overall file size of your photo.