diff --git a/src/app.py b/src/app.py
index 04aebd5..888524b 100644
--- a/src/app.py
+++ b/src/app.py
@@ -4,12 +4,14 @@ import yaml
 from fasthtml import serve
 
 from myfasthtml.controls.CommandsDebugger import CommandsDebugger
+from myfasthtml.controls.FileUpload import FileUpload
 from myfasthtml.controls.InstancesDebugger import InstancesDebugger
 from myfasthtml.controls.Layout import Layout
 from myfasthtml.controls.TabsManager import TabsManager
 from myfasthtml.controls.helpers import Ids, mk
 from myfasthtml.core.instances import InstancesManager, RootInstance
 from myfasthtml.icons.carbon import volume_object_storage
+from myfasthtml.icons.fluent_p3 import folder_open20_regular
 from myfasthtml.myfastapp import create_app
 
 with open('logging.yaml', 'r') as f:
@@ -49,10 +51,16 @@ def index(session):
                                         command=tabs_manager.commands.add_tab("Commands", commands_debugger),
                                         id=commands_debugger.get_id())
   
+  btn_file_upload = mk.label("Upload",
+                             icon=folder_open20_regular,
+                             command=tabs_manager.commands.add_tab("File Open", FileUpload(layout)),
+                             id="file_upload_id")
+  
   layout.header_left.add(tabs_manager.add_tab_btn())
   layout.header_right.add(btn_show_right_drawer)
-  layout.left_drawer.add(btn_show_instances_debugger)
-  layout.left_drawer.add(btn_show_commands_debugger)
+  layout.left_drawer.add(btn_show_instances_debugger, "Debugger")
+  layout.left_drawer.add(btn_show_commands_debugger, "Debugger")
+  layout.left_drawer.add(btn_file_upload, "Test")
   layout.set_main(tabs_manager)
   return layout
 
diff --git a/src/myfasthtml/assets/myfasthtml.css b/src/myfasthtml/assets/myfasthtml.css
index eca1506..9302f80 100644
--- a/src/myfasthtml/assets/myfasthtml.css
+++ b/src/myfasthtml/assets/myfasthtml.css
@@ -1,8 +1,20 @@
 :root {
     --color-border-primary: color-mix(in oklab, var(--color-primary) 40%, #0000);
+    --font-sans: ui-sans-serif, system-ui, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
+    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
+    --spacing: 0.25rem;
+    --text-sm: 0.875rem;
+    --text-sm--line-height: calc(1.25 / 0.875);
+    --text-xl: 1.25rem;
+    --text-xl--line-height: calc(1.75 / 1.25);
+    --font-weight-medium: 500;
+    --radius-md: 0.375rem;
+    --default-font-family: var(--font-sans);
+    --default-mono-font-family: var(--font-mono);
 }
 
 
+
 .mf-icon-16 {
     width: 16px;
     min-width: 16px;
@@ -219,6 +231,7 @@
     bottom: 0;
     overflow-y: auto;
     overflow-x: hidden;
+    padding: 1rem;
 }
 
 /* Base resizer styles */
@@ -299,6 +312,16 @@
     opacity: 1;
 }
 
+
+.mf-layout-group {
+    font-weight: bold;
+    /*font-size: var(--text-sm);*/
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+    margin-bottom: 0.2rem;
+}
+
 /* *********************************************** */
 /* *********** Tabs Manager Component ************ */
 /* *********************************************** */
diff --git a/src/myfasthtml/controls/FileUpload.py b/src/myfasthtml/controls/FileUpload.py
new file mode 100644
index 0000000..9a0106d
--- /dev/null
+++ b/src/myfasthtml/controls/FileUpload.py
@@ -0,0 +1,49 @@
+from dataclasses import dataclass
+
+from fasthtml.components import *
+
+from myfasthtml.controls.helpers import Ids, mk
+from myfasthtml.core.bindings import Binding, LambdaConverter
+from myfasthtml.core.dbmanager import DbObject
+from myfasthtml.core.instances import MultipleInstance
+
+
+class FileUploadState(DbObject):
+  def __init__(self, owner):
+    super().__init__(owner.get_session(), owner.get_id())
+    with self.initializing():
+      # persisted in DB
+      
+      # must not be persisted in DB (prefix ns_ = no_saving_)
+      self.ns_file_name: str = ""
+
+
+class FileUpload(MultipleInstance):
+  @dataclass
+  class BindingData:
+    filename: str = ""
+  
+  def __init__(self, parent, _id=None):
+    super().__init__(Ids.FileUpload, parent, _id=_id)
+    self._binding = self.BindingData()
+    self._state = FileUploadState(self)
+  
+  def render(self):
+    return Div(
+      mk.mk(Input(type='file',
+                  name='file',
+                  id=f"fn_{self._id}",  # fn stands for 'file name'
+                  value=self._state.ns_file_name,
+                  hx_preserve="true",
+                  hx_encoding='multipart/form-data',
+                  cls="file-input file-input-bordered file-input-sm w-full",
+                  ),
+            binding=Binding(self._binding, "filename")
+            ),
+      mk.mk(Label(), binding=Binding(self._binding, "filename",
+                                     LambdaConverter(lambda x: x.filename if hasattr(x, "filename") else x))),
+      cls="flex"
+    )
+  
+  def __ft__(self):
+    return self.render()
diff --git a/src/myfasthtml/controls/Layout.py b/src/myfasthtml/controls/Layout.py
index 209407b..553a0ed 100644
--- a/src/myfasthtml/controls/Layout.py
+++ b/src/myfasthtml/controls/Layout.py
@@ -69,20 +69,36 @@ class Layout(SingleInstance):
   class Content:
     def __init__(self, owner):
       self._owner = owner
-      self._content = []
+      self._content = {}
+      self._groups = []
       self._ids = set()
     
-    def add(self, content):
+    def add_group(self, group, group_ft=None):
+      group_ft = group_ft or Div(group, cls="mf-layout-group")
+      if not group:
+        group_ft = None
+      self._groups.append((group, group_ft))
+      self._content[group] = []
+    
+    def add(self, content, group=None):
       content_id = get_id(content)
       if content_id in self._ids:
         return
-      self._content.append(content)
+      
+      if group not in self._content:
+        self.add_group(group)
+        self._content[group] = []
+      
+      self._content[group].append(content)
       
       if content_id is not None:
         self._ids.add(content_id)
     
     def get_content(self):
       return self._content
+    
+    def get_groups(self):
+      return self._groups
   
   def __init__(self, session, app_name, parent=None):
     """
@@ -224,7 +240,14 @@ class Layout(SingleInstance):
     
     # Wrap content in scrollable container
     content_wrapper = Div(
-      *self.left_drawer.get_content(),
+      *[
+          (
+              Div(cls="divider") if index > 0 else None,
+              group_ft,
+              *[item for item in self.left_drawer.get_content()[group_name]]
+          )
+          for index, (group_name, group_ft) in enumerate(self.left_drawer.get_groups())
+      ],
       cls="mf-layout-drawer-content"
     )
     
diff --git a/src/myfasthtml/controls/helpers.py b/src/myfasthtml/controls/helpers.py
index bfd7c4b..88d79bf 100644
--- a/src/myfasthtml/controls/helpers.py
+++ b/src/myfasthtml/controls/helpers.py
@@ -11,6 +11,7 @@ class Ids:
   Boundaries = "mf-boundaries"
   CommandsDebugger = "mf-commands-debugger"
   DbManager = "mf-dbmanager"
+  FileUpload = "mf-file-upload"
   InstancesDebugger = "mf-instances-debugger"
   Layout = "mf-layout"
   Root = "mf-root"
diff --git a/src/myfasthtml/core/bindings.py b/src/myfasthtml/core/bindings.py
index 6ef71cf..aee50f6 100644
--- a/src/myfasthtml/core/bindings.py
+++ b/src/myfasthtml/core/bindings.py
@@ -129,6 +129,14 @@ class DataConverter:
     pass
 
 
+class LambdaConverter(DataConverter):
+  def __init__(self, func):
+    self.func = func
+  
+  def convert(self, data):
+    return self.func(data)
+
+
 class BooleanConverter(DataConverter):
   def convert(self, data):
     if data is None:
diff --git a/src/myfasthtml/core/dbmanager.py b/src/myfasthtml/core/dbmanager.py
index 1a922d0..a057a47 100644
--- a/src/myfasthtml/core/dbmanager.py
+++ b/src/myfasthtml/core/dbmanager.py
@@ -55,7 +55,7 @@ class DbObject:
       self._initializing = old_state
   
   def __setattr__(self, name: str, value: str):
-    if name.startswith("_") or getattr(self, "_initializing", False):
+    if name.startswith("_") or name.startswith("ns") or getattr(self, "_initializing", False):
       super().__setattr__(name, value)
       return
     
@@ -74,7 +74,8 @@ class DbObject:
       self._save_self()
   
   def _save_self(self):
-    props = {k: getattr(self, k) for k, v in self._get_properties().items() if not k.startswith("_")}
+    props = {k: getattr(self, k) for k, v in self._get_properties().items() if
+             not k.startswith("_") and not k.startswith("ns")}
     if props:
       self._db_manager.save(self._name, props)
   
diff --git a/src/myfasthtml/core/instances.py b/src/myfasthtml/core/instances.py
index e12cf24..466a289 100644
--- a/src/myfasthtml/core/instances.py
+++ b/src/myfasthtml/core/instances.py
@@ -38,6 +38,7 @@ class BaseInstance:
   def get_parent(self):
     return self._parent
 
+
 class SingleInstance(BaseInstance):
   """
   Base class for instances that can only have one instance at a time.
@@ -107,7 +108,11 @@ class InstancesManager:
       if instance_type:
         if not issubclass(instance_type, SingleInstance):
           assert parent is not None, "Parent instance must be provided if not SingleInstance"
-        return instance_type(session, parent=parent, *args, **kwargs)  # it will be automatically registered
+          
+        if isinstance(parent, MultipleInstance):
+          return instance_type(parent, _id=instance_id, *args, **kwargs)
+        else:
+          return instance_type(session, parent=parent, *args, **kwargs)  # it will be automatically registered
       else:
         raise
   
diff --git a/src/myfasthtml/core/instances_helper.py b/src/myfasthtml/core/instances_helper.py
index d7d34a3..e1a15d3 100644
--- a/src/myfasthtml/core/instances_helper.py
+++ b/src/myfasthtml/core/instances_helper.py
@@ -1,6 +1,7 @@
 import logging
 
 from myfasthtml.controls.CommandsDebugger import CommandsDebugger
+from myfasthtml.controls.FileUpload import FileUpload
 from myfasthtml.controls.InstancesDebugger import InstancesDebugger
 from myfasthtml.controls.VisNetwork import VisNetwork
 from myfasthtml.controls.helpers import Ids
@@ -12,6 +13,7 @@ logger = logging.getLogger("InstancesHelper")
 class InstancesHelper:
   @staticmethod
   def dynamic_get(parent: BaseInstance, component_type: str, instance_id: str):
+    logger.debug(f"Dynamic get: {component_type} {instance_id}")
     if component_type == Ids.VisNetwork:
       return InstancesManager.get(parent.get_session(), instance_id,
                                   VisNetwork, parent=parent, _id=instance_id)
@@ -21,6 +23,7 @@ class InstancesHelper:
     elif component_type == Ids.CommandsDebugger:
       return InstancesManager.get(parent.get_session(), instance_id,
                                   CommandsDebugger, parent.get_session(), parent, instance_id)
-    
+    elif component_type == Ids.FileUpload:
+      return InstancesManager.get(parent.get_session(), instance_id, FileUpload, parent)
     logger.warning(f"Unknown component type: {component_type}")
     return None
diff --git a/src/myfasthtml/core/utils.py b/src/myfasthtml/core/utils.py
index f4a66a4..47a3326 100644
--- a/src/myfasthtml/core/utils.py
+++ b/src/myfasthtml/core/utils.py
@@ -266,6 +266,7 @@ def post(session, b_id: str, values: dict):
   from myfasthtml.core.bindings import BindingsManager
   binding = BindingsManager.get_binding(b_id)
   if binding:
-    return binding.update(values)
+    res = binding.update(values)
+    return res
   
   raise ValueError(f"Binding with ID '{b_id}' not found.")
diff --git a/tests/core/test_db_object.py b/tests/core/test_db_object.py
index 065995a..1411991 100644
--- a/tests/core/test_db_object.py
+++ b/tests/core/test_db_object.py
@@ -106,6 +106,52 @@ def test_i_can_init_from_db_with_dataclass(session, db_manager):
   assert dummy.number == 34
 
 
+def test_i_do_not_save_when_prefixed_by_underscore_or_ns(session, db_manager):
+  class DummyObject(DbObject):
+    def __init__(self, sess: dict):
+      super().__init__(sess, "DummyObject", db_manager)
+      
+      with self.initializing():
+        self.to_save: str = "value"
+        self._not_to_save: str = "value"
+        self.ns_not_to_save: str = "value"
+    
+    to_save: str = "value"
+    _not_to_save: str = "value"
+    ns_not_to_save: str = "value"
+  
+  dummy = DummyObject(session)
+  dummy.to_save = "other_value"
+  dummy.ns_not_to_save = "other_value"
+  dummy._not_to_save = "other_value"
+  
+  in_db = db_manager.load("DummyObject")
+  assert in_db["to_save"] == "other_value"
+  assert "_not_to_save" not in in_db
+  assert "ns_not_to_save" not in in_db
+
+
+def test_i_do_not_save_when_prefixed_by_underscore_or_ns_with_dataclass(session, db_manager):
+  @dataclass
+  class DummyObject(DbObject):
+    def __init__(self, sess: dict):
+      super().__init__(sess, "DummyObject", db_manager)
+    
+    to_save: str = "value"
+    _not_to_save: str = "value"
+    ns_not_to_save: str = "value"
+  
+  dummy = DummyObject(session)
+  dummy.to_save = "other_value"
+  dummy.ns_not_to_save = "other_value"
+  dummy._not_to_save = "other_value"
+  
+  in_db = db_manager.load("DummyObject")
+  assert in_db["to_save"] == "other_value"
+  assert "_not_to_save" not in in_db
+  assert "ns_not_to_save" not in in_db
+
+
 def test_db_is_updated_when_attribute_is_modified(session, db_manager):
   @dataclass
   class DummyObject(DbObject):