Indicates the resolution (1280x720) and that the source was a high-definition stream.

The filename you provided contains common "scene" tags used by file-sharing sites:

Often features popular actors from the Indian digital erotica/drama space, such as Priya Gamre or Muskaan Agarwal (cast varies by segment). Plot Summary (Episode 3)

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The approximate file size, typically indicating a compressed version for easier mobile viewing. .mkv: The Matroska Video container format.