So i filled up 1 small container with fire element and then put a infuser on top and then placed a inert crystal and then it drained all the fire element from the container but i didnt get a fire crystal, ive tried several times but it still didnt work

What version are you on?
Are you piping element to the container?

1.16.5 and yes

What modpack are you on? what other mods are installed.

Modpack is Permafrost - Eyes of the storm

There is no reason this should not work, make sure your pipe is correctly setup as extracting from a side and inserting to the other.

Am i doing it wrong? cause i was watching a video of another person doing this and it worked for him without problems

Right click the pipe section connected to the extractor, it should change shape.

Thanks, seems to work now

No problem.