I have a specific need and I'm wondering if any of these static site hosts offer a solution. I have a static site I made for a friend's business and all they n

I have a specific need and I'm wondering if any of these static site hosts offer a solution. I have a static site I made for a friend's business and all they need is the ability to switch out a PDF on the site periodically. The approach I've done so far is to have a simple sinatra app that is password protected and gives them an upload form that replaces the pdf on the server. Do any of these hosts offer an asset manager that would let my friend manage images or pdfs via a simplified admin interface and then rebuild the site with the new assets?