Warn users about features about features that are about be removed.
The way that almost every PDF-annotations was removed leaving just a few basic functions without any warning or mention of it in the update log is extremely frustrating (version 10.34.11 to 10.37.1 i think). I am in charge of assisting 30-40 people using OneDrive as its primary synchronization tool and up until the recent versions we have been using the built-in PDF-annotations tools extensively. When this feature was removed without any warning or mention in the update-log, we basically came to a standstill. There is currently no good way to edit PDFs without exporting and importing every single file. I am sure the developers know that there are problems with iOS(files) integration, causing iOS to save duplicates etc and apps to fail.
The biggest concern regarding this is that something like this was removed without warning, this makes OneDrive a risky solution. Also, following up later versions(10.40.2) saying that you have listened to your users and improved the PDF-annotations as if you never had the previous functions there at all is borderline infuriating.