Thank you both for your replies. It was happening with both media and post uploads. I just resized an image and uploaded it perfectly so it must have been a size issue like graphical_force said. I didn’t expect that because it was the exact same image that I uploaded fine previously.
How should I be editing my picture to keep the quality. I don’t want to crop them, just a smaller version of my picture I guess?
I didn’t use a special program, just edit on my mac, but there were size options, and pixels per inch, etc. I wasn’t sure which one to use.