Do not know, if there is any FAQ about it.
I don't know the precise jD implementation.
I thought it's just as simple, as it try to download file, until service allows it.
wrzucajpliki.pl allows to start to download file until your remaining transfer is greater than 0.
It works the same as wplik.com, which is serviced well in jD -> one can start download if remaining transfer is greater than 0, even if remaining is less than choosen file.
Hope it helps.
I do not insist on any special implementation, of course.
Best!
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