The pop up appears when we try to insert a file with the same name (it works with a .zip too).
The options text color is black, not grey.

Point 1. The pop up for the file : the options text color is black, it should be grey

The text should be gray as we can see on the public demo :

Point 2. : The pop up for the zip : the options text color is black, it should be grey

The text should be gray as we can see on the public demo :