我正在嘗試編輯智慧型手機詳細信息，並且所有輸入欄位都有 dataRequired() 驗證。但是，影像的輸入檔預設為空。當我嘗試編輯其他欄位（例如品牌）時，還必須輸入圖像的輸入檔案才能成功編輯。如何讓輸入檔在提交表單後自動檢索資料庫中的image_URL？

image_URL 的輸入檔

{% for smartphone in smartphones %}
<div class="form-floating mb-4 justify-content-between">
                <img src="{{ url_for('static',filename = smartphone['image_URL']) }}" style="height: 250px;">
                <input type="file" id="image_URL" name="image_URL" accept="image/*">
            </div>
{% endfor %}

app.py 中的後端

@app.route('/editSmartphone/<int:id>',methods = ['GET','POST'])
def editSmartphone(id):
    smartphoneID = id
    conn = get_db_connection()
    smartphones = conn.execute('SELECT * FROM Smartphone WHERE id = ?',(smartphoneID,)).fetchall()

    form = editSmartphoneForm(request.form)
    if request.method == 'POST' and form.validate():
        conn.execute('UPDATE Smartphone SET brand = ?,model = ?,processor = ?, ram = ?, colour = ?, battery = ?, lowprice = ?, highprice = ?, screenSize = ?, refreshRate = ?, description = ?, image_URL = ? WHERE id = ?',(form.brand.data, form.model.data, form.processor.data, form.ram.data, form.colour.data, form.battery.data, form.lowprice.data, form.highprice.data, form.screenSize.data, form.refreshRate.data, form.description.data, form.image_URL.data, smartphoneID))
        conn.commit()
        conn.close()
        message = "Smartphone detail has been modified successfully"
        flash(message,'edited')
        return redirect('/manageSmartphone')
    return render_template('editSmartphone.html',smartphones = smartphones, form = form)