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    'SSH2_FXF_READ' => 0x01,
    'SSH2_FXF_WRITE' => 0x02,
...
    'SSH2_FXF_CREAT' => 0x08,
    'SSH2_FXF_TRUNC' => 0x10,
    'SSH2_FXF_EXCL' => 0x20,

SSH2_FXF_WRITE | SSH2_FXF_APPEND

use Net::SFTP::Constants qw( SSH2_FXP_WRITE SSH2_FXF_APPEND );