IMPORTANT: Changing the file extension settings affects which documents users can attach. Confirm that the affected file type is permitted under your organization's security policy before removing it from the blacklist.

1. Open Snow Management and Configuration Center (SMACC), then go to Configuration > Basic Settings.
2. Review EXTENSION_BLACKLIST and EXTENSION_WHITELIST for the affected file extension.
3. If the extension is listed in EXTENSION_BLACKLIST and your organization has approved the change, remove only that extension from the setting. For example, for .zip and .msg files, remove the zip and msg entries.
4. Try attaching the file to the agreement again.

If the extension is not in the blacklist or the file remains blocked, have your administrator review the settings before making further changes.