use CGI;

my $cgi = CGI->new();

my $lightweight_fh  = $cgi->upload('client_local_offer_image_url');

# undef may be returned if it's not a valid file handle
if (defined $lightweight_fh) {
    
    # Upgrade the handle to one compatible with IO::Handle:
    my $fh = $lightweight_fh->handle();

    open (my $OUTFILE, '>', 'some_file_path')
        or die "Couldn't open output file: $!";

    while (my $bytes_read = $fh->read($my chunk_of_data, 1024) ) {
        print {$OUTFILE} $chunk_of_data;
    }
}