Uploaded files for submissions not displayed right after selection

[jrmartino]

In the submission workflow, the step where files are uploaded via the Chose file button does not give an indication that files have been selected on that screen after upload, although they are listed on the following screen. This might make some users think that they may have not uploaded any files after doing so right at this stage. Should we put an updated list of files in this screen? Is de-selection also desirable here?