For the last three days, I have been trying to upload jpg images to both posts and pages, and I keep getting error messages. The first 2 or 3 images upload fine, but each additional image won't upload. The images are about 5 MB each. I am clicking "add media" to upload images (not using a plug-in). I'm getting the same error message regardless if I upload one image at a time or multiple images simultaneously. Please help.