How do I download a PDF with flask [duplicate]

Solution

from flask import send_file


@app.route('/return-files/')
def return_files_tut():
    filename = os.path.join(app.config['FACTURAS_FOLDER'],'Transferencia_a_otras_cuentas_1.pdf')
    return send_file(filename, attachment_filename='file.pdf', as_attachment=True)