Problem with multiple attachments

[F5SV1]

Hello.
I don't know what's going on.
After uploading two files to the server, i've trying to include this files to mail, but in upcoming message i have only one (this first). I check on the server, two files are available after in upload directory.

What is this?

$mail->AddAttachment('upload/'.$file1,$file1);
 $mail->AddAttachment('upload/'.$file2,$file2);

Thanks for help

Mick