suggested review changes

Author: plun1331

discord/components.py

@@ -1350,8 +1350,13 @@ def walk_components(self) -> Iterator[Component]:
 
 class FileUpload(Component):
     """Represents an File Upload field from the Discord Bot UI Kit.
+
     This inherits from :class:`Component`.
 
+    .. note::
+
+        This class is not useable by end-users; see :class:`discord.ui.FileUpload` instead.
+
     .. versionadded:: 2.7
 
     Attributes
@@ -1392,10 +1397,10 @@ def __init__(self, data: FileUploadComponentPayload):
     def to_dict(self) -> FileUploadComponentPayload:
         payload = {
             "type": 19,
-            "id": self.id,
+            "custom_id": self.custom_id,
         }
-        if self.custom_id:
-            payload["custom_id"] = self.custom_id
+        if self.id is not None:
+            payload["id"] = self.id
 
         if self.min_values:
             payload["min_values"] = self.min_values