this image his invalid dimensions

Hm.

Let me see what you can do it resize it.

i used a gif and it worked

Quote from pokemon , 02:47 PM 04/05/2019
i used a gif and it worked

You need to resize the image to whatever size fits.

Try to scale the image up. If the image is too small, the site has trouble automatically resizing it to fit the criteria.

Also, I had an issue with the same thing. All I did was simply try again. The second time it worked fine.

it means that its not the write size