The EnderIO Inventory Panel (when outside of a Compact Machine) does not seem to connect to inventories inside of a Compact Machine, no matter in which configuration the Item Conduits are.

Is this a bug or am I doing something wrong?

Alright, so I have to sonehow send an item to the buffer from the inside to access it from the outside?

You can only access the buffers from the outside. Works as intended.