Weeping between transfer case and transmission?

[jdamtb918]

Discovered this yesterday while I was under the truck. I noticed some areas looked like it had oily residue on it and traced it back up to where it looks like the trans mates up with the transfer case. I recently did a fluid swap on transfer case but areas I was working in are far enough away to make suspect something is possibly weeping from a seal? I don’t have any spots on the driveway indicating a major leak but nevertheless I’m still worried. Has anyone seen this before? The pic is where I think it’s coming from.

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[Dereku]

It looks so faint. Clean and monitor it. Could be anything honestly. Put some cardboard under the truck when parked too just to be sure.