Heya,

i'm using the latest 1.12.2 version, and i'm trying to figure out how to add liquids for some of the metals i have.

In the old version (before 2.3.x), i was able to add buckets for things like thaumcraft's void and thaumium ingots, but i'm not entirely sure how to do it in the newest version.

Is there any info on how to set those things up?

Cheers!

You can enable molten fluids for materials by adding to the passiveMaterialWhitelist in the molten module config.
For thaumium and void ingot fluids, you put "Thaumium", "Void" into the whitelist, with the quotes, following the TOML format.