macOS 12.3 Will Include Cloud Storage Changes Affecting Dropbox and OneDrive
Dropbox today announced that users who update to macOS 12.3 once that software version becomes available may temporarily encounter issues with opening online-only files in some third-party apps on their Mac.

In a support document and an email to customers, Dropbox said it is actively working on full support for online-only files on macOS 12.3 and will begin rolling out an updated version of its Mac app to beta testers in March. In the meantime, Dropbox users who update to macOS 12.3 will still be able to open online-only files in Finder.
Dropbox did not provide any further details, but Microsoft recently said macOS 12.2 will be the last version that supports its own cloud storage service OneDrive's current online-only files implementation. Microsoft said OneDrive will be getting a new online-only files experience that is "more integrated with macOS" and "will have long-term support from Apple," adding that the current version is built on several technologies that are "now deprecated."
Altogether, it appears likely that Apple has given cloud storage services like Dropbox and OneDrive advanced notice about system-level changes that will affect online-only files starting with macOS 12.3. We've reached out to Apple and Dropbox for further details, but so far have not received any additional information.
Apple will likely release macOS 12.2 within the next week or so, and then macOS 12.3 beta testing should begin shortly after that.
(Thanks, Brad!)
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