The "Bulk Assignment" page has some misconceptions about it due to it not actually being a page in which you can upload. Bulk Upload, does NOT refer to actually uploading file but rather is a feature that allows user's to add tags in bulk to videos that have ALREADY been uploaded.
The current "Bulk Uploads" page is a page that allows you to manage your Bulk Upload list, by allowing you to filter through your files with 4 methods, "File Name", "Folder Name", "Create Date" and "Actions". There are up (⬆️) and down (⬇️) icons in each filter, which allows you to see opposite sides of the filter (e.g. in "File Name" filter, the arrow keys shows an ascending and descending alphabetical order.)