this game.ini is usually located at
Windows:
..\Steam\steamapps\common\ARK\ShooterGame\Saved\Config\WindowsNoEditor\
Linux:
../Steam/steamapps/common/ARK/ShooterGame/Saved/Config/LinuxNoEditor/

Making this LootSystem work, requires you to place one LootSystem actor on your map.
As soon as you placed it, it will get it's settings from the game.ini and starts to apply buffs to given dino classes. You can only place one LootSystem for each map, if you try to place a second one it will give you an error message.

Main tag to put above, only required once (in game.ini)

Here you can find an example[paste.ee] on how to tweak this settings.
You can choose whatever LootSet# (Number) you like, only the prefix LootSet and ClassesForLoot has to stay the same. For example you could use LootSet1 and accordingly ClassesForLoot1 and as second entry LootSet5 and ClassesForLoot5.

If set to true it will suppress vanilla loot tables, even boss loot sets.

DebugLevel 2 will give enough but not to much information in the Log UI of the LootSystem. For Example DebugLevel 4 would give you every iteration step for each dino it is currently working on.

Range can be between 10 and 100 ms, this setting states delay time between each iteration step. Default is 10 ms, to decrease possibility for LatentActionError server crash you could try to increase this delay time. Only result will be that dinos around players will get their loot applied slower, depending on choosen delay time.

This option is a dynamic option, therefore you could change the number at the end. For example like LootSet2=, for further information, have look at this example[paste.ee]. Max Loot set number can only be 2147483646, because 32 bit integer cannot handle bigger numbers.

Here you need to add dino class pathes (like that one: /Game/PrimalEarth/Dinos/Achatina/Achatina_Character_BP.Achatina_Character_BP) to register previously set LootSet# for this dinos. For further information, have look at this example[paste.ee]. Be aware that you mustn't put more then 10.000 characters in one line of the game.ini, if you don't want your server to crash. Better to create multiple lines for one ClassesForLootX entry, the parser logic will append it for you in the background.