Bitwarden Send allows any user to securely share a piece of information, such as text or a file, with another person temporarily to reduce the risk of exploitation and data loss. Information shared is end-to-end AES-256 bit encrypted and can be 100% hidden from third-party applications with the addition of a password. Users can set expiration dates and access limits for shared information. Users with free accounts have access to Send for text information only. Bitwardsen Premium users can use Send to share passwords, documents, credentials, and more.
Source: https://www.helpnetsecurity.com/2021/03/16/bitwarden-send/