The faction I'm in has custom images for for it's datacards.
We like to include our custom image in the DC's we assign to factories from other parties.
If we assign this datacard to factories which are not ours, the custom image is not included. As for my understanding the custom image is part of the DC, so how does it work? What is the intended feature of this?
The DC is assigned to the faction, not the DC. Submitting a custom image isn't the same as setting a custom image. But yes, many custom rules are likely extremely outdated in general since the system was entirely changed (and is due for another rewrite). Are you assigned as the manager of the factory? The standard application rules apply even to DC customs as far as I'm aware. That means you either need to own the entity (in this case the factory) or need to be assigned manager of it. If it isn't operating that way, then there's probably some other weird issue going on (and would add to the long list of reasons the custom system needs entirely replaced).
Like I said previously, Dan, production customs are at a faction level, NOT a DC level. You assign the custom during production, not during the assignment. The custom rules were never updated to reflect the current system (which itself will likely be replaced in the nearish future) so they're largely non-factual. I'll see if we can go in and get the old rules replaced (not sure if that's on the asim end or dev team end).