.bmp images are uncompressed (so great when you are trying to save all the detail for things you might print) but they aren't usually used for images online. The common formats e.g. .jpg/.jpeg, .gif and .png should work. If you open them in an image program you should be able to 'save as' and save them as .jpg and then it will upload them.At least the ones with bmp which were older scans of printed photos. I will try attaching as file.