How to reload UPROPERTY data

Here is my example:
At the game start the “game instance” bp is loaded. There are lot of dependencies on this bp such as “Content manager” bp. “Content manager” has links to some meshes textures etc. I have put this meshes and textures into separated “.pak” file. If this “.pak” file is mounted before loading of “game instance” bp than everything works as intended. But is it possible to mount this “.pak” file after loading of “game instance” bp and just reload “content manager” bp so the links to textures and meshes will be recreated?