[contact form 7] impossible to send attached file

Hello,

I am “fighting” with contact form 7 to be able to receive attached files:

<p>Your Name (required)<br />
    [text* your-name] </p>

<p>Your Email (required)<br />
    [email* your-email] </p>

<p>Your Message<br />
    [textarea your-message] </p>

<p>Upload<br />
[file* attachment limit:4000000 filetypes:pdf|jpeg|jpg|doc|docx|txt|odf|zip]  </p>

<p>Please copy the text from the picture below<br />
[captchac captcha-305 size:m] <br />
[captchar captcha-305] <br /> </p>

<p>[submit "Send"]</p>

I did this and it said send successfull when I send the completed form.
I am using a gmail address to receive.
I receive the message but not the attachment.

In file attachments section I have add [attachment]

I receive the message but no attachment at all.

I tried to switch to different email address to receive the message, I tried to put a number instead of “attachment”…

thank you for your advices,
Régis