Hi!
Your tutorial is amazing btw but im having an issue importing your Ledge Grab place holder, its failing to import.
it states:
Error could not import SK_Mannequin duplicate bone names found.
(SK_mannequin’) each bone mush have a unique name
Multiple roots found
Import failed.
I tried to open the FBX in 3DS Max and get rid of the roots, this allowed me to import it. However in the Third Person Animation blueprint, It cant find the ledge grab animation and it wont let me drag it in 
Knowing me its probably something stupid 
P.S. im using 4.8.3
thanks for the the help!