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You went to this school and received no academic credit?
Seems to me that sending a transcript from the international institution may be the safest bet in this instance.
Did you study abroad for less than a year? Then you don’t need it.
Was it an American institution abroad? If so, you need it no matter what.
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Same thing here. I called LSAC just to make sure, and they said I didn’t need a foreign transcript. They do not show up on my LSAC account. It looks like I only went to school half a year that year 
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I had a similar situation, I studied abroad for a semester outside of my UG. due to a series of unfortunate events, the credits never transfered and so they wouldn’t appear on my lsac transcript or GPA. As I didn’t attend for more than a year (LSAC’s rule for counting Study abroad work) they won’t appear in my official grade calculation (also a bummer as it would have raised me…)
HOWEVER, I had the study abroad program send in the transcripts and a letter explaining them (mainly explaining the foreign grading system) to LSAC and this is included in your LSAC file…so you may want to do this so the LS can see you study abroad/did well and it doesn’t look like you did nothign for a year/semester.
just my $0.02/experience…