The attribute of changing from uploading a photo from the album or taking a photo by the camera is not enabled on all accounts and devices currently, you can try to resize the image you want to upload by cutting it smaller or choose another small picture, and if it didn't work, this means that this attribute is disabled.
You can change it only by choosing a picture from one of the generals available and exchange it with “Avatar Change” items or use it to gold if you don't have it.

Note:
If this attribute is unlocked on all accounts and devices in the future, we will notify you in the game.