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<style>
form{
   position:fixed;
   top:50%;
   left:45%;
   width:1250px;
}
</style>


<form id="form" method="POST" action="/" enctype="multipart/form-data">
    {{ form.hidden_tag() }}
    {{ form.file(size=20) }}
</form>

<script>
document.getElementById("file").onchange = function() {
    document.getElementById("form").submit();
};
</script>