If you get that messssage it means your files are too large. Try uploading them 1 by 1 first, the software resizes your files to a certain extent.
If that does not work, resize your pictures.
A long time ago I have enlarged the maximum allowable size for .jpg and .jpeg attachments to 1.5 MB and 1600 pixels width (ref.
http://www.mapleleafup.net/forums/sh...129#post240129)
Hope this helps