I am a newbie in w3schools. Once I tried to attach a .txt file with my post. But I am sorry to say that I couldn’t do this. It only showed the massage “Error This upload failed”. Please help me to solve the problem. Beside the “Attach This File” option, a massage is shown like “Used 0bytes of your 500K global upload quota (Max. single file size: 500K)” My question is what is the meaning of 500k? Thanks in advance!