I like what you've done here and congrats on the launch. I noticed two things about a PDF I uploaded.
1 - is there a way to set the default view to hide the left sidebar?
2 - I noticed when BrainyPDF provides an answer, some text that should be ALL CAPS was displayed as all lower-case instead (which isn't the proper case format in my PDF document; the terms would never be anything but Upper Case only.