We don't have a specific wizard to do that for you, but it seems like you could design something that uploads one file at a time but allows as many as you need or want. Look at how the popular web based email programs handle file uploads. Usually you click a button to start uploading files... it takes you to a dedicated page with just an upload field and a list of uploaded files so far (initially blank)... you upload as many files as you want, one at a time, then click done to go back to the original page... that is how I would do it.