One option is to dump using WD Sync. WD has moved that software to End of Support and now appears to suggest one use Goodsync instead for syncing files to/from the My Cloud.
WD Sync End of Support
https://support-en.wd.com/app/answers/detail/a_id/29023
GoodSync Free and Premium for WD My Cloud
WD has partnered with GoodSync to provide backup and synchronization to access the data stored on your WD NAS device. For more detailed information, product comparisons and technical support regarding GoodSync for WD, please refer to:
Important:
Please click to view the Use of Third-Party Software or Websites disclaimer
Western Digital Technical Support does not provide setup, configuration or installation of GoodSync products. Please refer to GoodSync Support to obtain support for GoodSync software. Click Here for GoodSync Technical Support
Edit to add: WD Sync creates hidden folders where it stores a history of files synced. Sometimes errors in syncing arise due to files stored in these hidden folders. Some have to resort to deleting the contents of these hidden folder(s) to fix some WD Sync issues. Others simply get rid of the WD Sync software all together and use third party sync programs like Free File Sync (https://freefilesync.org/).
