diff --git a/multi_user/bl_types/bl_file.py b/multi_user/bl_types/bl_file.py
index 36c2348..406247e 100644
--- a/multi_user/bl_types/bl_file.py
+++ b/multi_user/bl_types/bl_file.py
@@ -44,7 +44,7 @@ class BlFile(ReplicatedDatablock):
     bl_id = 'file'
     bl_name = "file"
     bl_class = Path
-    bl_delay_refresh = 1
+    bl_delay_refresh = 0
     bl_delay_apply = 1
     bl_automatic_push = True
     bl_check_common = False
@@ -56,7 +56,6 @@ class BlFile(ReplicatedDatablock):
         # TODO: handle packed_file
         # TODO: ensure absolute path
         # TODO: ensure file exist
-        logging.info(self.instance)
 
         self.preferences = utils.get_preferences()
         self.diff_method = DIFF_BINARY
@@ -105,18 +104,20 @@ class BlFile(ReplicatedDatablock):
         """
         logging.info(f"Writing {data['name']} to {target}")
 
-        # TODO: check fiile already exist
         # TODO: check for empty data
-        if target.exists() and (sys.getsizeof(data['file']) == self.instance.stat().st_size):
+
+        if target.exists() and not self.diff():
             logging.info("File already loaded, skipping.")
             return
         try:
             file = open(target, "wb")
-            file.write(data['file'])
+            file.write()
         except IOError:
             logging.warning(f"{target} doesn't exist, skipping")
         else:
             file.close()
 
     def diff(self):
-        return False
+        memory_size = sys.getsizeof(self.data['file'])-33
+        disk_size = self.instance.stat().st_size
+        return memory_size == disk_size
diff --git a/multi_user/bl_types/bl_font.py b/multi_user/bl_types/bl_font.py
index 3e45d92..7e81dce 100644
--- a/multi_user/bl_types/bl_font.py
+++ b/multi_user/bl_types/bl_font.py
@@ -21,9 +21,7 @@ import os
 from pathlib import Path
 
 import bpy
-import mathutils
 
-from .. import utils
 from .bl_datablock import BlDatablock
 from .bl_file import get_filepath
 from .dump_anything import Dumper, Loader
@@ -43,13 +41,11 @@ class BlFont(BlDatablock):
             return bpy.data.fonts.load(data['filepath'])
         else:
             filename = Path(data['filepath']).name
-
-            logging.info(f'loading {filename}')
-
             return bpy.data.fonts.load(get_filepath(filename))
 
     def _load(self, data, target):
-        pass
+        loader = Loader()
+        loader.load(target, data)
 
     def _dump(self, instance=None):
         return {
diff --git a/multi_user/bl_types/bl_sound.py b/multi_user/bl_types/bl_sound.py
index bd9bafb..91b163b 100644
--- a/multi_user/bl_types/bl_sound.py
+++ b/multi_user/bl_types/bl_sound.py
@@ -16,14 +16,16 @@
 # ##### END GPL LICENSE BLOCK #####
 
 
-import bpy
-import mathutils
-import os
 import logging
-import pathlib
-from .. import utils
-from .dump_anything import Loader, Dumper
+import os
+from pathlib import Path
+
+import bpy
+
+from .bl_file import get_filepath
 from .bl_datablock import BlDatablock
+from .dump_anything import Dumper, Loader
+
 
 class BlSound(BlDatablock):
     bl_id = "sounds"
@@ -35,40 +37,25 @@ class BlSound(BlDatablock):
     bl_icon = 'SOUND'
 
     def _construct(self, data):
-        if 'file' in data.keys():
-            prefs = utils.get_preferences()
-            ext = data['filepath'].split(".")[-1]
-            sound_name = f"{self.uuid}.{ext}"
-            sound_path = os.path.join(prefs.cache_directory, sound_name)
-            
-            os.makedirs(prefs.cache_directory, exist_ok=True)
-            file = open(sound_path, 'wb')
-            file.write(data["file"])
-            file.close()
-
-            logging.info(f'loading {sound_path}')
-            return bpy.data.sounds.load(sound_path)
+        filename = Path(data['filepath']).name
+        return bpy.data.sounds.load(get_filepath(filename))
 
     def _load(self, data, target):
         loader = Loader()
         loader.load(target, data)
 
-    def _dump(self, instance=None):
-        if not instance.packed_file:
-            # prefs = utils.get_preferences()
-            # ext = pathlib.Path(instance.filepath).suffix
-            # sound_name = f"{self.uuid}{ext}"
-            # sound_path = os.path.join(prefs.cache_directory, sound_name)
-            # instance.filepath = sound_path
-            instance.pack()
-            #TODO:use file locally with unpack(method='USE_ORIGINAL') ?
-
-        return {
-            'filepath':instance.filepath,
-            'name':instance.name,
-            'file': instance.packed_file.data
-        }
-
-
     def diff(self):
         return False
+
+    def _dump(self, instance=None):
+        return {
+            'filepath': instance.filepath,
+            'name': instance.name
+        }
+
+    def _resolve_deps_implementation(self):
+        deps = []
+        if self.instance.filepath and self.instance.filepath != '<builtin>':
+            deps.append(Path(self.instance.filepath))
+
+        return deps