So, today I'm like "O.k I made a new comic thumbnail, guess I sould change the old one" so I try and change it and... It doesn't work T_T Now, it's only for that one file that I try to upload. So when I try to upload anothor file it works...and I've been trying to upload my new comic thumbnail for the past 20 minutes >.> Can anyone help me with this? I've tryed everything

Just forget it...