After running the OOTB Export to Excel smart service, the resulting document does not inherit security from the parent folder into which it is saved, as described in the smart service documentation.
This issue has been addressed via AN-96987 in the following Appian hotfixes/versions:
Apply the latest hotfix to your Appian installation or upgrade to the latest version of Appian.
This article applies to Appian 17.4.
Last Reviewed: February 2018