Previously, while pasting from an external application, all the text formatting, tables, etc. were not retained and only plain text was pasted. 

Both Paste and Paste without formatting options used to behave similarly, i.e. only retaining plain text.
 In QuarkXPress 15.1, Paste from an external application helps you to retain all text formatting, tables, etc. In case you wish to paste text from an external application as plain text, you can continue to use Paste without Formatting option.

The shortcut keys are as bellow:


Paste: Command + V

Paste Without Formatting : Alt+Command+ V


Paste: Ctrl + V

Paste Without Formatting: Ctrl+Alt+U