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No, that hoster does not re-compress PNG. I took the checksum (sha256sum) of the file immediately after saving in OpenStego. Then uploaded to hoster. Then downloaded from hoster. Took checksum again of downloaded file. Checksum matches. Exactly the same file.
ah ok that make sense. But you can put also directly the whole nut string inside, no need for a nut.txt file.
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Put it where? As the Message File name?