Trying to Import Older Scrivener Projects

I’m in the process of creating a File Cabinet Scrivener folder - basically one folder to hold the various mini projects that I’m working on. The problem is, only about half of my Scrivener projects are showing as files that I can import. It seems to be an update issue - anything that was started recently is able to be imported, anything that I converted from the old Scrivener will open and can be worked with, but can’t be imported. In the image, you can see that I can import “blogs,” but can’t import “Building a house.”

I’d really like to be able to pull everything together so it’s easier to keep track of my projects. Any suggestions?

Isn’t that a Scapple file, that Building a house, and not a Scrivener file? Looks like a Scapple icon to me.