“As a SharePoint Administrator or Global Administrator in Microsoft 365, you can block download of files from SharePoint sites or OneDrive. This feature does not need Azure Active Directory conditional access policies. This feature can be set for individual sites and cannot be set at the organization level.”
One of the aspects that the new Syntex Advanced Management license covers is the restriction of file downloads from a SharePoint Online site or OneDrive for Business account. This feature is designed to provide enhanced protection for sites that contain highly confidential data by requiring users to access and work with files using their web browser. Even the use of Office desktop applications is prohibited since they download a temporary copy of files to a local device.
At present, the block download feature is still in its preview phase. To activate this policy for a site, you must use the Set-SPOSite cmdlet from the latest version of the SharePoint Online management PowerShell module.
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How to use the SharePoint Block Download Policy
SharePoint Online's new Block Download Policy is a feature that allows administrators to restrict downloads of certain file types from SharePoint sites. This can be used to help protect proprietary data and intellectual property stored in SharePoint, as well as ensure compliance with regulatory requirements.
Administrators can choose which file types are allowed or blocked, based on the organization’s security needs. The policy applies to all users accessing content stored in a site, including external users who have been granted access. It also applies when files are downloaded through OneDrive for Business or Office 365 applications such as Outlook and Teams.
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SharePoint and OneDrive unmanaged device access controls for administrators - SharePoint in Microsoft 365 | Microsoft Learn
7 days ago — Learn how administrators can block download of files from a SharePoint and OneDrive without using conditional access policies.
7 days ago — Go to Access control in the new SharePoint admin center, and sign in with an account that has admin permissions for your organization. Note.
Block download is available for view-only sharing links to Office documents and other file types, such as PDFs, images, audio, and other non-text and non-video ...
Under Search, click Search and offline availability. In the Offline Client Availability section, select 'No'. To allow users to download content with the sync ...