Here's a suggestion, just to make sure you are looking at the right evidence when you say that the append operation is not working on the file (I'm also fixing your indentation a bit, and improving the error checking/reporting):
my $original_size = -s $target_full_path; # how many bytes in the fil
open( my $out, ">>", $target_full_path) # I like using lexical file
+ handles, and
or die "Can't open $target_full_path: $!"; # reporting system erro
print $out $fetchdata or die "print to file failed: $!";
close $out or die "Unable to close output file: $!";
my $current_size = -s $target_full_path; # how many bytes now
printf( "File %s was %d bytes, is now %d bytes\n",
$target_full_path, $original_size, $current_size );
Maybe the reports you get from that version will tell you what you need to know.
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