Here's how you can upload multiple pictures from PhotoBucket at one time. First select all the photos that you want to upload. Then click generate HTML and IMG code. See the following screenshots.
Once that is done just paste it in the window like this

Then click Preview at the bottom of the page. When the preview loads it should populate the pictures then you can click submit and it will show like this.  If you did everything correctly It will show all the pictures like below. I hope this helps all the PhotoBucket users.