Hey there,
I have lots of problems importing/migrating content of one project to another because this causes lots of errors. To be specific, I try importing an Enemy with AI to my project (it´s this one: [FREE] AAA Quality Horror Game Monster (Animations and AI Included) ).
I tried replacing some stuff but there are pins connected with each other that shouldn´t be connected with. At least thats what UE is telling me.
And some more errors in the animation section, but I think I first need to fix this. 
Hope you can help me out. This would save me a lot of time.
Thanks.