HELP!! Been working on a photo and exported it. Went through at 1024 megapixels and file size of 250KB no worries. Then went back, reset the photo to the beginning and started another develop. Cropped the same and similar adjustments but a better look. Changed the file name but kept the size the same and hit the export key. Now the damn thing won't export. A box keeps coming up saying cannot export within 250KB. I tried lowering the file size in megapixels but it keeps saying the same. What have I done wrong?