If you have a second generation single bay My Cloud that has been updated to OS5 firmware, see the dedicated OS5 subforum for the single bay/single drive My Cloud.
OS5 My Cloud
If you have a multi bay My Cloud model that has been updated to OS5, see the specific OS5 subforum for that device.
One can use the forum search feature (magnifying glass icon upper right) those OS5 specific subforums for issues similar to yours. For example: