Setting it up
Navigate to in the dashboard, add a channel, and choose the emoji. Order matters. The bot reacts in the order you list them, and reactions cannot be reordered afterwards on Discord’s side, so an upvote you want on the left has to be first in the list.Which emoji you can use
Your server’s own custom emoji and standard Unicode emoji both work. Heimdall’s own emoji cannot be used here. They belong to the bot’s application rather than your server, and Discord does not allow those as reactions at all. The picker on this page simply does not offer them, and if an older rule contains one it is flagged so you can see why that reaction never appears. An emoji that has since been deleted from your server is flagged the same way, because a stale emoji and one of the wrong kind look identical from the ID alone and need different fixes.Required permissions
Auto reactions are fully automatic, so members need no permission. The bot needs Add Reactions and Read Message History in each configured channel.