I am having the same issue as this person. There is no error code to speak of, and it might just be that feature is not available on the WD My Cloud App.
Basically, here's where the issue comes up. Say someone sends me a picture on Whatsapp, and i would like to upload that picture into my MyCloud drive. The first step is to click on the picture, then hit share, which gives you an array of options (Instagram, Twitter, email, etc). So i click on the WD MyCloud icon. Normally, using a service like Dropbox, or Google Drive, when you hit share, it gives you the option to save the file and also to save it in a specific folder within your cloud. Instead, when i click Share, it takes me to the "Downloads" Folder of the MyCloud app, with no option to save the file.
I also run into the same issue with my SMS app or any app where i can save files.
Maybe this feature is not integrated on the app? or is there a way to set this up?
Also, here's the specs on my mobile device:
-Samsung Galaxy Note 4 running Lollipop 5.0.1
-Latest update of the WD MyCloud app (as of 4/5/2015
-Firmware version: v04.01.03-421
Thank you in advance,