Add ephemeral attachment field

discord/message.py

@@ -169,9 +169,14 @@ class Attachment(Hashable):
         The attachment's `media type <https://en.wikipedia.org/wiki/Media_type>`_
 
         .. versionadded:: 1.7
+    ephemeral: Optional[:class:`bool`]
+        If the attachment is ephemeral. Ephemeral attachments are temporary and
+        will automatically be removed after a set period of time.
+
+        .. versionadded:: 2.0
     """
 
-    __slots__ = ("id", "size", "height", "width", "filename", "url", "proxy_url", "_http", "content_type")
+    __slots__ = ("id", "size", "height", "width", "filename", "url", "proxy_url", "ephemeral" "_http", "content_type")
 
     def __init__(self, *, data: AttachmentPayload, state: ConnectionState):
         self.id: int = int(data["id"])
@@ -183,6 +188,7 @@ class Attachment(Hashable):
         self.proxy_url: str = data.get("proxy_url")
         self._http = state.http
         self.content_type: Optional[str] = data.get("content_type")
+        self.ephemeral: Optional[bool] = data.get("ephemeral")
 
     def is_spoiler(self) -> bool:
         """:class:`bool`: Whether this attachment contains a spoiler."""

discord/types/message.py

@@ -53,6 +53,7 @@ class _AttachmentOptional(TypedDict, total=False):
     height: Optional[int]
     width: Optional[int]
     content_type: str
+    ephemeral: bool
     spoiler: bool