No one is going to bother with your side project if the first chance they attempt to use it, they simply can't. They'll say to themselves "oh well, I guess it's still a work in progress" and move on and forget about it. Posting a Show HN project is like an elevator pitch, you've got to capture the interest of your target audience quickly and be able to deliver at least a viable product. Not supporting PDF isn't a huge issue, that's just a future feature but not even allowing someone to use it is a failure even if the tech is sound.

This thing looks cool and if I was in real estate or apartment management, I'd probably be interested in trying it out. But if I can't, I'm just going to forget about it since I've probably already got a solution for 3D renders. At the very least, the emails are collected so OP can send out a blast saying it works now and hopefully some people give it another shot.