LOG=/ABSLOG= command-line . But log is not saved

I have been opening two instances of my game using Powershell. I use the command line argument -LOG and -ABSLOG but I must be doing something wrong as no matter where I look I cannot ever find a log.

PS C:\Users> & "C:\Program Files\Epic Games\UE_4.27\Engine\Binaries\Win64\UE4Editor.exe" 
"C:\Users\Documents\Unreal Projects\3_Steam_Multiplayer-master\UnrealProject\PuzzlePlatforms\PuzzlePlatforms.uproject" 
-game -log -ABSLOG='C:/mylog.txt'

I read here:
Is it possible to store logs in an absolute path? - Development Discussion / C++ Programming - Unreal Engine Forums which is how I found ABSLOG.

Is there any way I can just write the LOG to a txt file?

thanks