Could your photos be a bit...ummm..."portly"? The size limit for an individual photo or other file is 10240KB or roughly 10 Megabytes, or 25 total for up to four. If you've got your camera set to "ultramegawhopping" resolution, you may want to dial that back in your camera's settings. We may not need to see the squirrel on the horizon's pores. Also, if your photos are sporting some other fancy format or filename suffix than jpg, jpeg (mostly Apple), gif or png, then that will also give the Forum system indigestion.