What it does
Pick an item in the Relic window and two things happen: the item goes on your clipboard, and Relic presses paste for you in the app you came from. One press of Enter and the text is in the box you were typing in.
Turn it off and picking an item only copies it. The window still closes, and you press Ctrl + V (Cmd + V on a Mac) yourself. Some people prefer that, because it leaves the last step in their hands.
This is about the window and the mini picker. The quick paste keys and the paste stack always try to paste for you, since there is no window to pick in.
On a Mac
macOS asks before any app may press keys on your behalf. Relic needs that permission to paste for you, and asks for it in the General pane. Granting it takes a trip to System Settings, then a re-check.
Without it, the item is still copied. Relic says so once each time it starts, so a shortcut that seems to do nothing is explained rather than mysterious:
The same permission is what lets Relic take your selection when you press the save and annotate shortcut. Everything else in Relic works without it.
On Linux
On a Wayland desktop, no app is allowed to press keys in another app. There is no permission to grant, so Relic cannot paste for you there, whatever this setting says. The item is copied and you paste it yourself. Relic mentions it once per run:
Terminals
Terminals paste with Ctrl + Shift + V. On Linux, Relic notices it is pasting into a terminal and sends that chord instead, so picking an item works there too.
- If a paste lands in the wrong place, the app you came from probably lost focus while the window was open. Click into the field first, then open Relic.
- If nothing pastes but the item is on your clipboard, paste it yourself. That is the sign that the keystroke could not be sent.
The rest of the General pane, including this row and the Mac permission, is on Settings: General.