Submitting A Manual On Here

I have a couple of manuals in pdf format that came straight from the company website for that Device, that are not on Helpowl or Manualowl and I would like to submit these. However, when I get to the "Manuals" page for that device I don't see the gray box that reads "Submit you manual here"  Is there a reason some devices allow a Manual to be downloaded but not others? I mean, I see multiple manual's for some devices and the gray "Submit" box is still present in case someone wishes to add one more to the list of already submitted Manuals for that device. How do I submit the first Manual for a device on here when the device is on here but not the manual is not, and won't even provide an option to Submit one? Please note: I appreciate you only answer if you know the reason for this and/or a resolution.  Do not second-guess with "Maybe it's because..." or "It could be"...  Thank you