Unable to upload phtotos

Maybe the reasons are as follows: 1.the format of the photo is not correct. 2.the size of the photo is too large. 3.the browser shielded the popup window. So what do you think the problem is? if that are not right, tell me, and i will seek for other solved methods.

Don't worry, try it on another computer. If you still failed to do that, it means it's the website's problem. If you succeeded, it means there is some problem on your own computer, maybe virus or something else is on your way. There is a problem bothering me a lot. Why can't I get any reward from one of my referrals, he have indeed earned something.