Box 21 on the K1 will indicate foreign taxes paid (or accrued).
K3's cannot be attached to the return if you efile (or any other form for that matter). TT probably not willing to pay $$ to enable that feature since so few users would utilize it and would open up a whole new host of security risks.
Options are:
1) Snail mail return with K3's included
2) Submit w/o K3's and hope IRS never notices or does not care. They are critically understaffed at this moment in time.
