If one is using a single bay/single drive My Cloud they should read through the issues (in this OS5 subforum) that unit is having with the OS5 firmware before upgrading to OS5. Particularly issues with the indexing that may render their device unusable/inaccessible for a period of time.
The missing text/graphics is something that’s been complained about in the past.
One option is to collect the My Cloud system log files and open a support case (and send them those log files) with WD Support.
How to Collect My Cloud System Logs
https://support-en.wd.com/app/answers/detail/a_id/18374
Contact Us | WD Support
https://support.wdc.com/contact.aspx
Another option is to try and do a manual firmware update.
My Cloud OS 5: How to Manually Update From My Cloud OS 3
https://support-en.wd.com/app/answers/detail/a_id/30092
My Cloud OS 5: How to Update From My Cloud OS 3
https://support-en.wd.com/app/answers/detail/a_id/29813
