Compatibility with Mac Pages and Numbers

Just copied all my documents to Mycloud.   Using Finder, everything is useable, but if I try to use the WD Mycloud App, none of these docs have copied across correctly.  Anyone else had similar problems?

The WD MyCloud App uses the Webdav protocol to manipulate files and the file handlers for various applications don’t work very well. So several apps cannot just open the files when you double click on them through this app, or save the files back there. You will have to download the file locally, them upload.