I use Arcsoft Photo Studio. I can re-size the picture just fine on this end.
The one on the top is about 200x200, the one at the bottom is 600x600
I used the paper clip attachment button to attach both photos.
Didn't matter what the size of my picture is, by using the paper clip button
to attach them made them both display at the same size with in the post.
So to get a bigger picture on here , the picture needs to be uploaded
to a host on the Internet and then put in as an image link. like I did
on the big picture in a previous post , No?
Added Later:
Method using a large pictures and a small picture using the paper clip
attachment method, both picture came out the same size, if you click
on the thumbnail the picture comes up in a separate window as it's original size.
to me this is the best way to post a picture.