index.html

<div style="text-align: center;">
    <form enctype="multipart/form-data" id="ocrForm" method="post"> <!-- Do not forget to add: enctype="multipart/form-data" -->
        {% csrf_token %}
        {{ form }}
        <button type="submit" class="btn btn-success">OCRzed</button>
    </form>
</div>