Troubleshooting & messages · Undo, move back and Recycle Vault
Why does Send here say it can't tell which side is the source?
Short answer: Items are ticked on both sides, so Send here can't tell the direction. Untick one side, then press Send here and choose Copy or Move.
Send here sends ticked items into whatever folder the opposite side is showing. If you have items ticked on both sides, it can't know which direction you mean.
Untick everything on one side, then press Send here again. You'll be asked whether to Copy or Move.