#en la vista
<input type="file" name="data"/>
#En el modelo/base de datos
db.define_table('bot_upload',
                Field('bot_id', 'reference bot'),
                Field('bot_file', 'upload')) #este es el campo importante
#En el controlador
def f():
    stream = request.vars['data'].file
    filename = request.vars.['data'].filename
    file_id = db.bot_upload.insert(bot_id = vars['bot_id'],
                                   bot_file = db.bot_upload.bot_file.store(stream,filename=filename))
    return dict(file = file_id, filename = file_id.bot_file)