Sensitivity Label PDF support is now available in SharePoint Online and OneDrive for Business. In effect, this means that SharePoint can protect and process PDFs in the same way as it handles Office documents. Given the widespread use of PDFs in many organizations, this is an important step forward for those wishing to protect their most sensitive information.
After that, I am able to add sensitivity labels for PDFs through properties. However, after a few hours, it stops working, and the sensitivity label option is not showing for the PDF file in properties.
Could you please share the details of how it will be displaying?