Dropzone widget ergonomy

[sveetch]

• Don't like the big icons display for each file, can lead to huge container if many files are uploaded in a one shot, i would prefer file list as a list, but don't know yet how to design this;
• Actual behavior is simply to redirect to the form when an upload is complet, even if there are error or not. Resulting that error are not visible anymore, it's a big issue;
• Empty Dropzone widget take too much height;

If some graphist/ergonomist expert have a solution, i will be pleased to review it.