A flash of hope! But, alas, that did not work. I tried both

open my $fh, "<", $img
    or die "Can't open $img: $!";
my $raw = <$fh>;
[download]

and

open my $fh, "<:raw", $img
    or die "Can't open $img: $!";
my $raw = <$fh>;
[download]

I know my use of Net::Twitter works to post text, it's just this picture updating that is failing. I suppose it could be a problem with the module itself. Maybe I should try it with some LWP or REST mojo...?

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