Can you be very specific by what you
mean by Import?
Copy or migrate an .uasset from an content folder of one project into the content folder of another project.
I can see from the project files you
uploaded that there is an issue with
the assets, but this is somewhat
normal when you copy and paste the
project files from one project to
another without the Migrate feature.
The Redirectors can get broken if not
migrated properly from the engine.
I might have copy and pasted them into the content folder opposed to used the migrate feature in UE4.
Let me try something and I will get back to you. If it does not work then I will let you know. If it does work I will let you know. 