Inbox Tray on Discord

What it signals here

server usage

Used in server channels named #submissions, #applications, or #inbox to indicate where content should be sent.

reaction use

As a reaction it means 'received' or 'I'll check this out'; also used to acknowledge someone sharing something.

emote mapping

Custom server emotes styled after this emoji are used in suggestion or bot channels.

gaming context

Used when receiving loot, items, or trade requests in gaming communities: 'new item in the 📥'

role meaning

In role-assignment bots or channels, it can represent receiving or accepting a new role.

See it elsewhere