Hey BenjvC,
So in order to edit this setting, simply open the project you are receiving that message with, and bring up the console command (~) tilde key.
Then type ‘r.Streaming PoolSize ####’
In your case, you wouldn’t need to go all the way up to 4000 MB, but instead go up to something like 1200 to see if that clears the issue. If the max number you are seeing is 170 MB, then increasing it from 1000 MB (default) to 1200 MB will cover those textures that are not fitting within the pool memory size.
Also, you want to edit the settings per project, which means you won’t be going into the engine version folder, but your actual projects folder (Unreal Projects), and open YourProjectName\Config\DefaultEngine.ini.
It is there you will see these settings…
Let me know if you still need help.
Thanks,
Andre