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Depending on your device and internet speed, uploading can take a while, as on any site. Can you try waiting for some time and see if it is uploaded then? If it still doesn't work, which browser are you using?

I tried waiting for some time but it still shows uploading.I will try it next time.I use chrome browser.

We just looked into our image uploading and found an issue that can affect a few users, we just rolled out an update that should fix this. Please let us know if you experience further issues!