fiid = params_kw.fiid or 'supply_contract_attach'
fmgr = ContractAttachMgr(fiid)
stat = await fmgr.add_file(request, params_kw)
if stat.status == 'success':
    return UiMessage(title='上传成功', message='文件已添加')
return UiError(title='上传失败', message=stat.message or 'unknown error')