Hi Mike, welcome to FiberglassRV. We're glad you're here!
After you upload to the Document Center it must be approved by a moderator before made viewable by the membership. That's to ensure it's not a duplicate or placed in the wrong area.
Typically only brand-specific brochures/manuals go into the manufacturer brand areas. Appliance manuals, converters, etc. have their own space and it's because many brand use the same appliances, etc.
There is NO Trailer Brand Manufacturer folder for the Casita
I'll send a message to the admins and get one made for you. It's possible it won't show up until the end of the weekend. Patience.