Iím aware that the character Jose Chung appears in one episode in both series but does that even count as a crossover?
Sure, I don't see why not, especially since he was a memorable guest star in both. Add that to Frank Black's appearance in an X-Files
episode, and I think that pretty much states that the two shows are definitely set in the same universe.
Except for that one episode of Millennium
where they were watching The X-Files
Really? Huh, I don't remember that, but it's been years since I've watched Millennium
. What episode was it?