Answer: It may be the photo that you select to upload into blogger is too big. We suggest you reduce the photo size bellow to 100kb per picture.
How to reduce the photo(image) size?
Your may use IrfanView to reduce the image size. It is freeware.
It is trying to be simple for beginners and powerful for professionals.
IrfanView is trying to create new and/or interesting features in its own way, unlike some other graphic viewers, whose whole “creativity” is based on feature cloning, stealing of ideas and whole dialogs from ACDSee and/or IrfanView! (for example: XnView has been stealing/cloning features and whole dialogs from IrfanView, for 7+ years).
IrfanView was the first Windows graphic viewer WORLDWIDE with Multiple (animated) GIF support.
One of the first graphic viewers WORLDWIDE with Multipage TIF support.
The first graphic viewer WORLDWIDE with Multiple ICO support.
You may download the software at http://www.irfanview.net/