Yup. You are right. My bad, it was not that obvious, but... you have to experiment here.
- You can go to form controls
- find upload control (I guess this one you looking for) and enable it for text and system tables.
- Now go back to module -> classes -> user settings -> fields and add new field text - choose text.
- For form control click more items... -> choose upload. Here is the trick - The text type will be replace with file. Now you have a field which is file and uses the upload control.
Now you can go to users, pick any user and you can see this.
it should give the idea how to approach this issue: Enabling form control and try it out. The upload it will not work "out of the box", because it is meant to work with forms, but you can clone it and customize its behavior. By default it saves files to site code name/BizFormFiles/ folder. You might as well try other uploaders from controls: just check which one is easier to customize for your needs.
P.S. On second thought: You can always use selection controls: file selector, url selector etc, they will keep path to your file. You can have a folder where all users files are and keep path to
a file for an individual user.