diff --git a/bot/fediverse_service.py b/bot/fediverse_service.py
index 2d12d89..d4e32fe 100644
--- a/bot/fediverse_service.py
+++ b/bot/fediverse_service.py
@@ -1,5 +1,5 @@
 from abc import ABC, abstractmethod
-from typing import List, Optional
+from typing import List, Optional, Union, BinaryIO
 from fediverse_types import FediverseNotification, FediversePost, Visibility
 
 
@@ -54,4 +54,21 @@ class FediverseService(ABC):
         Returns:
             FediversePost object if found, None otherwise
         """
+        pass
+    
+    @abstractmethod
+    def upload_file(self, file_data: Union[BinaryIO, bytes], filename: Optional[str] = None) -> str:
+        """
+        Upload a file to the Fediverse instance.
+        
+        Args:
+            file_data: File data as binary stream or bytes
+            filename: Optional filename for the uploaded file
+            
+        Returns:
+            File ID that can be used in posts
+            
+        Raises:
+            RuntimeError: If file upload fails
+        """
         pass
\ No newline at end of file
diff --git a/bot/misskey_service.py b/bot/misskey_service.py
index 845ed27..e8bd396 100644
--- a/bot/misskey_service.py
+++ b/bot/misskey_service.py
@@ -1,5 +1,5 @@
 import misskey
-from typing import List, Optional, Dict, Any
+from typing import List, Optional, Dict, Any, Union, BinaryIO
 from fediverse_service import FediverseService
 from fediverse_types import (
     FediverseNotification, FediversePost, FediverseUser, FediverseFile,
@@ -138,4 +138,16 @@ class MisskeyService(FediverseService):
             note = self.client.notes_show(noteId=post_id)
             return self._convert_misskey_post(note)
         except Exception:
-            return None
\ No newline at end of file
+            return None
+    
+    def upload_file(self, file_data: Union[BinaryIO, bytes], filename: Optional[str] = None) -> str:
+        """Upload a file to Misskey Drive"""
+        try:
+            from misskey.exceptions import MisskeyAPIException
+            
+            media = self.client.drive_files_create(file_data)
+            return media["id"]
+        except MisskeyAPIException as e:
+            raise RuntimeError(f"Failed to upload file to Misskey Drive: {e}") from e
+        except Exception as e:
+            raise RuntimeError(f"Unexpected error during file upload: {e}") from e
\ No newline at end of file
diff --git a/bot/pleroma_service.py b/bot/pleroma_service.py
index 1e53cd7..7333df0 100644
--- a/bot/pleroma_service.py
+++ b/bot/pleroma_service.py
@@ -1,5 +1,5 @@
 from mastodon import Mastodon
-from typing import List, Optional, Dict, Any
+from typing import List, Optional, Dict, Any, Union, BinaryIO
 from fediverse_service import FediverseService
 from fediverse_types import (
     FediverseNotification, FediversePost, FediverseUser, FediverseFile,
@@ -152,4 +152,12 @@ class PleromaService(FediverseService):
             status = self.client.status(post_id)
             return self._convert_mastodon_status(status)
         except Exception:
-            return None
\ No newline at end of file
+            return None
+    
+    def upload_file(self, file_data: Union[BinaryIO, bytes], filename: Optional[str] = None) -> str:
+        """Upload a file to Pleroma instance"""
+        try:
+            media = self.client.media_post(file_data, mime_type=None, description=filename)
+            return str(media["id"])
+        except Exception as e:
+            raise RuntimeError(f"Failed to upload file to Pleroma: {e}") from e
\ No newline at end of file