UtilitechAS.amsreader-firmware/web/upload.html

<form method="post" enctype="multipart/form-data">
    <div class="my-3 p-3 bg-white rounded shadow">
        <div class="row">
            <div class="col-lg-6">
                <div class="input-group mb-3">
                    <div class="input-group-prepend">
                        <span class="input-group-text">Upload</span>
                    </div>
                    <div class="custom-file">
                        <input name="file" type="file" class="custom-file-input" id="fileUploadField">
                        <label class="custom-file-label" for="fileUploadField">Choose file</label>
                    </div>
                </div>
            </div>
        </div>
        <div id="firmware-warn" style="display: none;">
            <br/>
            <div class="alert alert-danger">
                WARNING: Units powered over M-bus must be connected to an external power supply during firmware upload. Failure to do so may cause power-down during upload resulting in non-functioning unit.
            </div>
        </div>
    </div>
    <hr/>
    <div class="row form-group">
        <div class="col-6">
            <a href="javascript:history.back();" class="btn btn-outline-secondary">Back</a>
        </div>
        <div class="col-6 text-right">
            <button class="btn btn-primary">Upload</button>
        </div>
    </div>
</form>