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.

There's certain folders I never want synced/backed up. I'm a developer and a lot of my projects are synced with OneDrive. They're some folders (ex: node_modules) that I don't want synced.

The other reason this is important is I sync all my documents, downloads, pictures, etc. This adds up to a lot of files. I've found that OneDrive uses a lot of CPU to monitor these files. If they're sets of files/folders that I never want monitored it can help CPU performance. I have tested this theory by archiving a lot of old directories and also removing folders with lots of files in them (ex: node_modules). OneDrive went from taking ~80% CPU down to 8% to monitor file differences.

*English follows Japanese

■Title(件名)：
Excel 2016 for Mac で Excel ファイルを利用中に、ファイルが破損して修復することができない

Excel files are unexpectedly corrupted while using the Excel files on OneDrive for Business with Excel 2016 for Mac devices.
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■Description(内容):
Excel 2016 for Mac で OneDrive for Business 上の Excel ファイルを利用中に、ファイルが破損して修復することができない場合がある。Excel 2016 for Mac のバージョンを、16.13.1 (180523) に更新したところ、修復をして開くことができるようになったが、別の端末では引き続き修復ができず、開くことができない。OneDrive for Business のバージョン履歴を利用しても 1.0 まで戻さなければ開けない状態で、開けていた時のバージョンには戻せない状況。

なお、端末によってはバージョンの更新によって動作が変わったこと、および、下記の Microsoft コミュニティに今回の事象と類似した投稿 (日本語のみ) があったことから、Office クライアントに起因する可能性がある。

<参考情報>
タイトル : Office 2016 for mac で「'XXXX.xlsx' の一部の内容に問題が見つかりました。」エラー
アドレス : http://answers.microsoft.com/thread/6c6eaedf-4c6b-4fd7-83e5-e98ba6232fd9

現在はローカル PC 内にファイルを保存するとファイルが開けるため、そちらで対処するが、大変不便であるため、改善してほしい。​

Currently, We are concerned that the Excel file may be unexpectedly corrupted then it cannot be repaired in some cases while using the Excel files on OneDrive for Business with Excel 2016 for Mac devices eventually.

In order to avoid this event, there is a way to restore and open the file by updating the version of Excel 2016 for Mac to 16.13.1 (180523). However, it is confirmed that another device cannot be applied a workaround even if you update the versions. In addition to this, you cannot open it unless reverting the version history to 1.0 even you use the version history of OneDrive for Business, also it is not allowed to revert to the version before file corruption.

Thus, we are assuming that this event occurs because of any bugs or misconfiguration of the system of the Office Client. Since the stable service is not provided to all devices, I found an article regarding the similar event in the Microsoft Community described below.

<Reference information>

-Title: "There was a problem with some content of 'XXXX.xlsx' in Office 2016 for Mac" error
-URL: https://answers.microsoft.com/ja-jp/msoffice/forum/msoffice_excel-mso_mac-mso_mac2016/office-2016-for-mac-でxxxxxlsx/6c6eaedf-4c6b-4fd7-83e5-e98ba6232fd9

We are currently using the method to open a file by saving them beforehand in the local PC as a workaround. For above reasons, we strongly hope this event will be mitigated and provides the stable service to use Excel files smoothly from Mac devices as well.

Thank you for your continued support.

I installed the new version of OneDrive for Business (MacOS), with selective sync.
Whenever it got to a ".DS_Store" file, though, it would get "hung up", and would stop syncing. I contacted MS Tech Support and was directed to an article which appeared to be helpful in that it clearly addressed the issue I was experiencing, and eventually was able to get the Mac to complete the sync by deleting the .DS_Store files (which was a bit of a challenge, but I figured it out).

The issue is not just that the Mac won’t sync the “.ds_store” files, but that it gets “stuck” on them and won’t complete the rest of the sync. It seems to me that the “getting stuck” part is something that should be resolved at the software level, rather than at the user level. OneDrive should report the error, of course, but then it should be able to proceed with the rest of the sync, anyway.

I have been running OneDrive App on Mac OS El Capitan (10.11.6) for a couple of years without issue. It was last automatically updated on 8 May 2018 via Apple's Mac OS App Store. Today 20 May 2018 when I booted my MacBook, OneDrive app kept on crashing on loading. I uninstalled the app and then reinstalled via the Appstore, and same problem. I used CleanMyMac app to uninstall and remove all associated fiIes, deleted the OneDrive folded and reinstalled, and OneDrive sill crashes immediately after opening. I even downloaded the app via the Microsoft website and reinstalled, and still the same problem. The Mac OS crash report is included in the attached file. How do I get OnDrive app working again?

Regards,
Keith