File upload not working

My website https://fiction-atlas.com relies heavily on contact form 7 for price quotes. I am not getting any of the files that are submitted to me. I can see the name of them, but cannot download them. they are not attached.

My form is located at https://fiction-atlas.com/services

The code I am using is as follows:

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

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

<p><b>How did you find Fiction-Atlas? (required)</b><br />
[text* HowdidyoufindFiction-Atlas id:howdidyoufindus]

<p><b>Services Requested</b><br />
<br />
[checkbox* checkbox-277 id:ServicesRequested class:services "Copy Editing" "Cover Design" "Formatting" "Book/Promo Trailer" "Beta Read" "Press Kit" "3-D Mock-ups" "Social Media Graphics" "Audio Recordings"]
<p><b>Approx. Word Count (If Applicable)</b><br />
[text ApproximateWordcountifapplicable]

<p><b>Tell Me About Your Project</b><br />
    [textarea your-message] </p>

<p><b>Upload Sample Chapter -- 800 to 2,500 words) </b><br />
<p>[file file-613 id:samplechapterfile class:samplechapterfile]
<p>This is required for Copy Editing or Beta reading <b>only</b>! <br> This must be provided to get an accurate price quote.<br>

<p><b>Are You Human?</b> [quiz quiz-129 "0+1=|1" "5+2=|7" "10+7=|17"]

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

And here is what is in the mail section:

From: [your-name] <[your-email]>
Subject: [your-subject]

Message Body:
[your-name]
[your-email]
[HowdidyoufindFiction-Atlas]
[checkbox-277]
[your-message]
[file-613]
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This e-mail was sent from a contact form on Fiction-Atlas  (https://fiction-atlas.com)