in application.py [0:0]
def saveFile():
f = request.files['filename']
application.config['UPLOAD_FILE_PATH'] = os.path.join(application.config['UPLOAD_FOLDER'], f.filename)
f.save(application.config['UPLOAD_FILE_PATH'])
# reset output data when a new file is uploaded
global data_output
data_output = {}
return redirect("/dashboard", code=302)