diff --git a/gradio/inputs.py b/gradio/inputs.py
index 62fac86a19..3da585f1ba 100644
--- a/gradio/inputs.py
+++ b/gradio/inputs.py
@@ -67,7 +67,7 @@ class AbstractInput(ABC):
         """
         All interfaces should define a method that rebuilds the flagged input when it's passed back (i.e. rebuilds image from base64)
         """
-        pass
+        return msg
 
 class Textbox(AbstractInput):
     """
@@ -356,6 +356,16 @@ class Sketchpad(AbstractInput):
     def process_example(self, example):
         return preprocessing_utils.convert_file_to_base64(example)
 
+    def rebuild_flagged(self, dir, msg):
+        """
+        Default rebuild method to decode a base64 image
+        """
+        im = preprocessing_utils.decode_base64_to_image(msg)
+        timestamp = datetime.datetime.now()
+        filename = f'input_{timestamp.strftime("%Y-%m-%d-%H-%M-%S")}.png'
+        im.save(f'{dir}/{filename}', 'PNG')
+        return filename
+
 
 class Webcam(AbstractInput):
     """
@@ -393,6 +403,16 @@ class Webcam(AbstractInput):
             im, (self.image_width, self.image_height))
         return np.array(im)
 
+    def rebuild_flagged(self, dir, msg):
+        """
+        Default rebuild method to decode a base64 image
+        """
+        im = preprocessing_utils.decode_base64_to_image(msg)
+        timestamp = datetime.datetime.now()
+        filename = f'input_{timestamp.strftime("%Y-%m-%d-%H-%M-%S")}.png'
+        im.save(f'{dir}/{filename}', 'PNG')
+        return filename
+
 
 class Microphone(AbstractInput):
     """
diff --git a/gradio/outputs.py b/gradio/outputs.py
index 553b93c7b3..5e9735991b 100644
--- a/gradio/outputs.py
+++ b/gradio/outputs.py
@@ -48,7 +48,7 @@ class AbstractOutput(ABC):
         """
         All interfaces should define a method that rebuilds the flagged input when it's passed back (i.e. rebuilds image from base64)
         """
-        pass
+        return msg
 
 
 class Textbox(AbstractOutput):