fix: retain original File item urls for editing

discord/components.py

@@ -670,18 +670,36 @@ class UnfurledMediaItem(AssetMixin):
     def __init__(self, url: str):
         self._state = None
         self._url: str = url
+        self._static_url: str | None = (
+            url if url and url.startswith("attachment://") else None
+        )
         self.proxy_url: str | None = None
         self.height: int | None = None
         self.width: int | None = None
         self.content_type: str | None = None
         self.flags: AttachmentFlags | None = None
         self.attachment_id: int | None = None
 
+    def __repr__(self) -> str:
+        return (
+            f"<UnfurledMediaItem url={self.url!r} attachment_id={self.attachment_id}>"
+        )
+
+    def __str__(self) -> str:
+        return self.url or self.__repr__()
+
     @property
     def url(self) -> str:
         """Returns this media item's url."""
         return self._url
 
+    @url.setter
+    def url(self, value: str) -> None:
+        self._url = value
+        self._static_url = (
+            value if value and value.startswith("attachment://") else None
+        )
+
     @classmethod
     def from_dict(cls, data: UnfurledMediaItemPayload, state=None) -> UnfurledMediaItem:
 
@@ -696,7 +714,7 @@ def from_dict(cls, data: UnfurledMediaItemPayload, state=None) -> UnfurledMediaI
         return r
 
     def to_dict(self) -> dict[str, str]:
-        return {"url": self.url}
+        return {"url": self._static_url or self.url}
 
 
 class Thumbnail(Component):

discord/ui/file.py

@@ -90,6 +90,11 @@ def size(self) -> int:
         """The size of this file in bytes, if provided by Discord."""
         return self._underlying.size
 
+    def refresh_component(self, component: Component) -> None:
+        original = self._underlying.file
+        component.file._static_url = original._static_url
+        self._underlying = component
+
     def to_component_dict(self) -> FileComponentPayload:
         return self._underlying.to_dict()