Alert: Problem with using Google group for hosting images for posts, etc.

I prepared a post Uploading and manipulating images Part 2 (click "BACK" button to get back to this page) and used a Google group Photostore to host the photo. When I first previewed and published the post, the image appeared OK. Then for some reasons, I checked the post and found the photos to be replaced by blank boxes. I then proceed to upload the photo to My Photo Store - More cats in town, a blog created specially to host photos, obtained the URL of the photo as outlined in this post Getting New Blogger (formerly Blogger Beta) to host photos for the profile, sidebar, header, etc. (click "BACK" button to get back to this page). Now the photo appeared OK in the post. Now I would be much more careful about using Google group to host photos for my blog.