Why the long drag fails

To move a file from a full-screen Finder window into a full-screen app on another Space, macOS expects you to start the drag, then switch Spaces mid-drag — a trackpad swipe with your remaining fingers, a hover over the screen edge, or a ⌘-Tab while holding the button. Let go at the wrong moment and the file lands wherever the cursor happens to be. It works, but it is a stunt.

Dragging a file between two full-screen apps means holding the drag across Spaces. With DropK the shelf works as a midpoint. ONE LONG, FRAGILE DRAG Finder — Space 1 Figma — Space 2 hold the drag,trigger the swipe,don’t let go...? TWO SHORT DRAGS Finder DROPK SHELF asset.png Figma drop it on the shelf,switch Spaces calmly,drag it out
One fragile drag across Spaces vs. two short drags via the shelf

The shelf method: two short drags

  • Drag one: drop the file onto the DropK shelf in the menu bar. The drag ends there — nothing to hold.
  • Switch: move to the other Space or full-screen app at your own pace. The shelf floats above whatever is frontmost.
  • Drag two: pull the file off the shelf into its destination.

Because each drag is short and ends on a stable target, there is nothing to time and nothing to hold. The same pattern covers window-to-window moves on one screen, and carrying several files at once — park the whole group, switch, then drag them out together.

It is not only files

The shelf holds links, text, images, and folders the same way, so “move this thing to that app” works whether the thing is a PDF or a paragraph. With clipboard tracking on, copied items land on the shelf too — useful when the source app fights drag selection.

When you don’t need a shelf

For a single file between two visible windows, plain drag and drop is fine. The shelf earns its place when Spaces, full-screen apps, or more than one item are involved — which, on a laptop screen, is most of the time. More patterns like this in tips and tricks, or get DropK free on the Mac App Store.