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   my $r = Apache::Request->new(
        shift,
        POST_MAX        => 10 * 1024 * 1024,    # in bytes, so 10M
        DISABLE_UPLOADS => 0
    );

&MYMod::Add::Add($r);

 my $r = Apache->request;

...
        POST_MAX        => 10 * 1024 * 1024,    # in bytes, so 10M
        DISABLE_UPLOADS => 0
    );

&MYMod::Add::Add($r);