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 curl ENDPOINT \
  -H "Authorization: Bearer ACCESS_TOKEN" -X POST \
  -F attributes='{"name":"test.txt", "parent":{"id":"0"}}' \
  -F file=@test.txt

my $json = encode_json {"name" => "test.txt", "parent" => {"id" => 0}}
+;

...
           Content_Type => 'multipart/form-data' .
  );