Fill in HTML form with DROPBOX integration.

We want our clients to log into an account with their own username and password. Then be able to pick from a list of products that we update every other week. Those list of products are attached to actual audio files saved in dropbox. In dropbox their is a folder for every hour of the day. Our clients can pick a product for a specific time, it then gets saved within dropbox under their name within the hour slots they have chosen it. So for instance if they choose product 1 for 8am 9am 12pm etc, the product/audio file gets duplicated to each of those folders on dropbox. They never go into dropbox or have access to it. Choosing off the list what they want and when from the HTML fill in form where they sign in with their own username and password. We have approximately 20 -30 such clients. We as the providers of the audio/products to pick from will only upload to one forlder in DROPBOX and the automation for each of the clients should happen from that one folder. Our clients may request specific products that is not on their sheet and we then wil make it for them specific. They will have to type that specific request into their online fill in form, it will send a email to us with specific request for that work, with the detail they have filled in. What fields needs to be in that form, we will discuss further as soon as we get an interested party to assist in our product.