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To allow users to upload a PDF file through an HTML form,
you can use the <input> element with the type attribute set to "file."
<body>
<h1>Upload a PDF</h1>
<form action="upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="pdfFile" accept=".pdf">
<input type="submit" value="Upload PDF">
</form>
</body>