My connection dropped (it happens). After one minute it got back again.
Check the difference between Dropbox icon and OneDrive on the attached image.
Dropbox felt the connection dropping, but also realised that it got back together and continued working. After I'm disconnected OneDrive just gives up, It never even bothers checking if my connection is back. I have to close and restar the software.

COME-ON! It should SYNC, so that means it should keep actively looking for my files and for my connection. This is not someone I hired and that needed a break because it got tired, THIS IS SOFTWARE! MAKE IT WORK 24/7, no coffee time for it.

I am getting a throughput of 2MBits/second on average. This is wholly unacceptable. My ISP provides me 15MBits per second upload links. Either build more server farms and localize them to each metropolitan area, host using another providers cloud, or increase your number of fiber optic links to your network center with carriers like Verizon, AT&T, L3, etc. so that the servers on your system can handle at least 15MBits/second if not more. Uploading a GB of data should not be taking this long. Files are large these days, we are sold 1TB of data as part of Office 360. If you need to then up the fee $1.00 per month to add bandwidth or something. If your team cannot get a higher throughput somehow soon then your OneDrive service quickly is becoming obsolete. If 100% of your users cannot upload at the same time at high-speed as if everyone is uploading their data all at once, then your system is antiquated. you should have double redundant backup capacity at minimum using full-speed links. I'd say at least 10MBits/second throughput for the home user on a 15MBits/second channel. Come on now, there is 10000BaseT Ethernet out there and Microsoft should be using it and maximizing data transfer speed. Thank you so much for your help.

It would be super great to be able to set expiration dates within the On-Demand files feature so that, if after X number of days have passed a local file has not been opened, it is automatically removed and reverts back to online status.

If we're using the On-Demand features, chances are we already feel a little tight on space (or know we're going to have to reckon with storage issues soon). Having to go back through an entire directory and free up space per file or folder saves any kind of maintenance until the last minute we when are hurting for space and have to free up stuff ASAP. But being able to configure the On-Demand file to keep (or let go) of local files based on how much we actually use them would do some ongoing maintenance that would really give the On-Demand Feature some sticking power.

*English follows Japanese

■Title(件名)：
Files On-Demand 利用時の、iWork (Pages , Numbers , Keynote) アプリケーションのエラー表示について
An error message at File On-Demand for iWork apps

■Description(内容):
Mac OS X にて Files On-Demand を使用して OneDrive for Business へ iWork (Pages , Numbers , Keynote) のファイルをアップロード後に編集 /保存 すると [<ファイル名> を自動保存できませんでした。このファイルは、別のアプリケーションによって変更されました。 予期しない変更が起きたため、Keynoteでは変更内容を保存出来ない可能性があります。] という警告が表示される。
iWork のバージョン管理機能と Files On-Demand 機能の親和性の問題と考えられるが、可能である場合にはエラーが出ないように改善してほしい。

I saw the error message [<file name>Could not be saved automatically. This file has been modified by another application. Due to unexpected changes, keynote may not be able to save changes.] when I tried to edit/save the iWork (Pages, Numbers, Keynote) files after those files are uploaded to OneDrive for Business via Files On-Demand at Mac OS X.

It sees the issue related to the compatibility between iWork versioning and Files On-Demand, so it would be very appreciated if the error message won’t be shown.

Thank you for your consideration.

Since a recent update the Menubar icon keeps beach-balling and check in Activity Monitor and it's "Not Responding". Force quit it and re-run it and if you are quick you can get into preferences and that runs ok but close preferences, click on menubar icon again and it's beach-balling/Not Responding forever.

Kill then re-run the app and it will sync properly. And whilst beach-balling/Not Responding it will still sync OK (menubar icon changes to show syncing, files sync, menubar icon changed back - so it's the UI or something that is locked-up as clicking on or moving mouse over menubar icon will show a beach-ball (Activity Monitor showing "Not Responding" (and it's not suing CPU in this state).

macOS 10.13