Hi Sharon,
Save the PDF as an attachment in the note or as a file in the sharepoint site, which is determined by whether the entity has enabled sharepoint Document management.
- If the entity has not enabled sharepoint Document management, the when the user export to PDF and save to dyanmics 365, it will save as an attachment of the note in the timeline.
- If the entity has enabled sharepoint Document management, the when the user export to PDF save to dyanmics 365, it will store as a file in the sharepoint site.
Test:
The Invoice has not enabled sharepoint Document management.

Then I export to PDF and save to dyanmics 365, it will save as an attachment of the note in the timeline.


Next I enabled sharepoint Document management for Invoice entity.

Then I export to PDF, "save to dyanmics 365" is changed to "save to sharepoint", and it will store as a file in the sharepoint site.


In summary, as long as the entity is enabled sharepoint Document management, the PDF will store as a file in the sharepoint site.
The steps to enable are going to Advanced Settings > Documents Management > Document Management Settings, then select the entity.
