We're trying to implement a file locking mechanism to prevent multiple users from editing the same file at the same time causing conflicts. Our previous implementation worked well on Ventura, but on Sonoma, even when just previewing a file in Finder in Column View, as opposed to editing, it locks. This is the same behaviour we experienced with Apple's FruitBasket sample code. There is a isFileViewerRequest flag inside the NSFileProviderRequest object provided with the NSFileProviderReplicatedExtension enumerator function. We thought this would indicate a file being edited. After further investigation, we were told that the isFileViewerRequest flag just indicates if a file is being presented, not just edited. We find the intended behaviour a bit strange, why would anyone want an icon next to a file to indicate presented? Why is the behaviour working fine on Ventura as a locking mechanism but on Sonoma it can only be considered a presented mechanism? If the intended behaviour is to indicate a file being presented, why did it change behaviour going from Ventura to Sonoma? A feature that was useful in Ventura becomes useless in Sonoma and the fix is for us to adjust to a new meaning of it. My main question is the following: Is there a recommended mechanism to determine if a file is being edited so that we can implement locking to avoid simultaneous editing? Thanks