I have a web page that I need to add some functionality.
I need the user to be able to upload a PDF document to the page. Once it is uploaded, it will need to be appended to the current PDF document that is online. The user may add multiple documents over time so the process has to allow for that.
The website is written in PHP and is running on a Ubuntu [url removed, login to view] server. Any libraries or applications needed can be installed.