Getting Rid of Arbitrary file number


Some of the files on my website are downloadable. However, when people click on the file to open it in another window and save it, it does not keep the file name I carefully assigned to it. Omeka simply assigns some arbitrary file name with a bunch of random letters and numbers. How can I change this? The Archive File name and the original File name are completely different from the file name I personally assigned to the item. Can you please help me? In addition, how can I change the footer in the Berlin style website? I need to change some links there. Thank you!