1. copy a cell by ctrl+c
2. copy text outside the web page e.g. browser's URL bar
   • this will copy data into client-side clipboard
3. select other cell for pasting later
4. click ctrl or alt key at least once
5. click ctrl+v to paste data
   • ZSS will paste data by server-side AU first
   • then, ZSS will paste data from client-side clipboard again

If we don't do step 4, the copy-and-paste will work correctly.

Note that in ZSS 2.5 cell data will be replaced by empty text.