You can only upload files up to 10 MiB in size each from the following types: JPEG, GIF, PNG, PDF. Please make sure that the image is not blurry or distorted and has plenty of contrast. Remember that they should be legible when printed out. The documents must be upright (not upside down) and in portrait mode (taller than wider). Other common office file formats (Word, Excel, PowerPoint) are supported as well.