This pop-up appears because of Apple's Handoff feature, which enables a Universal Clipboard across your Apple devices. When you copy something on a nearby device like a Mac, your iPad offers to paste it into Concepts.

If you do not use this feature, you can disable it in your Mac's System Settings.

How to Disable Handoff on macOS

  1. Open System Settings on your Mac.
  2. Go to General, then find AirDrop & Handoff.
  3. Turn off the setting for "Allow Handoff between this Mac and your iCloud devices."