The thing with Booth's application is that it allows copy/paste, which is nice. However, when you copy and paste into text boxes, some of your punctuations turn into question marks, which is a hassle to change back. Allowing for uploading documents creates an easier platform for applicants, most of the time. The uploading automatically turns your document into a PDF file, which basically is a replica of your document, but only in a more secure way. The newly-created PDF file changes absolutely nothing, and can still be viewed.