Overwrite files (not working)

I install WD Discovery app. This create mapped network drive (from work over internet, not local network). I can copy files, delete files. Works great. But if I want copy file, that’s already are there, then I get error message – There is not enough memory to complete this operation.

If I use My cloud home page, then there is no overwrite, but copy with (1) in file name.

How to fix it?