Steps to reproduce the issue

The current use of bootstrap wells etc in a modal for the top and the bottom can be confusing to users since the upload and navigations are hidden without scrolling etc. I would like to suggest making the top thumbnail list or grid well fixed and the bottom upload a photo fixed as well. Here is my suggestion.

Expected result

.browser {
height: 325px;
width: 100%;
overflow: auto;
position: relative;
margin: 40px 0 40px 0;
padding: 40px 0;
}

.well {
margin: 0px;
position: fixed;
top: 0;
width: 94%;
z-index: 2;
}

Actual result

System information (as much as possible)

Additional comments