diff --git a/examples/store.py b/examples/store.py
index f1e3d932..5b09fd0f 100644
--- a/examples/store.py
+++ b/examples/store.py
@@ -1,16 +1,20 @@
 import asyncio
+from pathlib import Path
+from typing import Optional
 
 import click
 from aleph_message.models import StoreMessage
 from aleph_message.status import MessageStatus
-from mypy.dmypy_server import MiB
 
 from aleph.sdk.chains.common import get_fallback_private_key
 from aleph.sdk.chains.ethereum import ETHAccount
 from aleph.sdk.client import AuthenticatedAlephClient
 from aleph.sdk.conf import settings
+from aleph.sdk.types import Account, StorageEnum
+from aleph_message.utils import Mebibytes
 
 DEFAULT_SERVER = "https://api2.aleph.im"
+MiB = 2**20
 
 
 async def print_output_hash(message: StoreMessage, status: MessageStatus):
@@ -55,30 +59,36 @@ async def do_upload(account, engine, channel, filename=None, file_hash=None):
         await print_output_hash(message, status)
 
 
-async def do_upload_with_message(account, engine, channel, filename=None, item_hash=None):
+async def do_upload_with_message(
+    account: Account,
+    engine: StorageEnum,
+    channel: str,
+    filename: Optional[str] = None,
+    item_hash: Optional[str] = None,
+):
     async with AuthenticatedAlephClient(
         account=account, api_server=settings.API_HOST
     ) as session:
         print(filename, account.get_address())
         if filename:
             try:
-                with open(filename, "rb") as f:
-                    # Do something with the file
-                    content = f.read()
-                    if len(content) > 1000 * MiB and engine == "STORAGE":
-                        print("File too big for native STORAGE engine")
-                        return
-                    message = await session.create_store_with_message(
-                        file_content=content,
-                        channel=channel,
-                        storage_engine=engine.lower(),
-                        file_hash=item_hash
-                    )
-                    return message
-            except IOError:
+                p = Path(filename)
+                content = p.read_bytes()
+                if len(content) > 1000 * MiB and engine == "STORAGE":
+                    print("File too big for native STORAGE engine")
+                    return
+                message = await session.create_store_with_message(
+                    file_content=content,
+                    channel=channel,
+                    storage_engine=engine.lower(),
+                    file_hash=item_hash,
+                )
+                return message
+            except Exception as e:
                 print("File not accessible")
                 raise
 
+
 @click.command()
 @click.argument(
     "filename",