I want to change the avatar in WeChat. I remember why I couldn't find my photographs.

I hope I can help you: first, recall whether you have changed your mobile phone before, check your cloud backup, and then set it up to see if WeChat can access your mobile phone photo album. If the above situation does not appear, it is likely that your photography has been deleted. If your mobile phone has the recent deletion function, you can go there and look for it!