I've spent half the day trying to post pictures of my 15, but when I get thru uploading attachments, and hit post message, it tells me my attachment is canceled because it exceeds 200 megapixels. I don't have my 8 year old grand daughter here to help me. I have a mac, and my pictures are in I PHOTO. any help would be greatly appreciated.
Here is a way to resize on a MAC:
If that don't work you can find a few different ways by doing a Google search for "resizing photos on a mac"
Once you muddle through the steps a few times it will become second nature.