diff --git a/replicate/file.py b/replicate/file.py
index 28be784a..53d9ea76 100644
--- a/replicate/file.py
+++ b/replicate/file.py
@@ -71,6 +71,8 @@ def create(
         """
 
         if isinstance(file, (str, pathlib.Path)):
+            file_path = pathlib.Path(file)
+            params["filename"] = file_path.name
             with open(file, "rb") as f:
                 return self.create(f, **params)
         elif not isinstance(file, (io.IOBase, BinaryIO)):
@@ -92,7 +94,9 @@ async def async_create(
         """Upload a file asynchronously that can be passed as an input when running a model."""
 
         if isinstance(file, (str, pathlib.Path)):
-            with open(file, "rb") as f:
+            file_path = pathlib.Path(file)
+            params["filename"] = file_path.name
+            with open(file_path, "rb") as f:
                 return await self.async_create(f, **params)
         elif not isinstance(file, (io.IOBase, BinaryIO)):
             raise ValueError(
diff --git a/tests/test_file.py b/tests/test_file.py
index 6efc60c0..c92802eb 100644
--- a/tests/test_file.py
+++ b/tests/test_file.py
@@ -3,11 +3,108 @@
 
 import httpx
 import pytest
+import respx
 
 import replicate
+from replicate.client import Client
 
 from .conftest import skip_if_no_token
 
+router = respx.Router(base_url="https://api.replicate.com/v1")
+
+router.route(
+    method="POST",
+    path="/files",
+    name="files.create",
+).mock(
+    return_value=httpx.Response(
+        201,
+        json={
+            "id": "0ZjcyLWFhZjkNGZiNmY2YzQtMThhZi0tODg4NTY0NWNlMDEy",
+            "name": "hello.txt",
+            "size": 14,
+            "content_type": "text/plain",
+            "etag": "746308829575e17c3331bbcb00c0898b",
+            "checksums": {
+                "md5": "746308829575e17c3331bbcb00c0898b",
+                "sha256": "d9014c4624844aa5bac314773d6b689ad467fa4e1d1a50a1b8a99d5a95f72ff5",
+            },
+            "metadata": {
+                "foo": "bar",
+            },
+            "urls": {
+                "get": "https://api.replicate.com/v1/files/0ZjcyLWFhZjkNGZiNmY2YzQtMThhZi0tODg4NTY0NWNlMDEy",
+            },
+            "created_at": "2024-08-22T12:26:51.079Z",
+            "expires_at": "2024-08-22T13:26:51.079Z",
+        },
+    )
+)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("async_flag", [True, False])
+@pytest.mark.parametrize("use_path", [True, False])
+async def test_file_create(async_flag, use_path):
+    client = Client(
+        api_token="test-token", transport=httpx.MockTransport(router.handler)
+    )
+
+    temp_dir = tempfile.mkdtemp()
+    temp_file_path = os.path.join(temp_dir, "hello.txt")
+
+    try:
+        with open(temp_file_path, "w", encoding="utf-8") as temp_file:
+            temp_file.write("Hello, world!")
+
+        metadata = {"foo": "bar"}
+
+        if use_path:
+            file_arg = temp_file_path
+            if async_flag:
+                created_file = await client.files.async_create(
+                    file_arg, metadata=metadata
+                )
+            else:
+                created_file = client.files.create(file_arg, metadata=metadata)
+        else:
+            with open(temp_file_path, "rb") as file_arg:
+                if async_flag:
+                    created_file = await client.files.async_create(
+                        file_arg, metadata=metadata
+                    )
+                else:
+                    created_file = client.files.create(file_arg, metadata=metadata)
+
+        assert router["files.create"].called
+        request = router["files.create"].calls[0].request
+
+        # Check that the request is multipart/form-data
+        assert request.headers["Content-Type"].startswith("multipart/form-data")
+
+        # Check that the filename is included and matches the fixed file name
+        assert b'filename="hello.txt"' in request.content
+        assert b"Hello, world!" in request.content
+
+        # Check the response
+        assert created_file.id == "0ZjcyLWFhZjkNGZiNmY2YzQtMThhZi0tODg4NTY0NWNlMDEy"
+        assert created_file.name == "hello.txt"
+        assert created_file.size == 14
+        assert created_file.content_type == "text/plain"
+        assert created_file.etag == "746308829575e17c3331bbcb00c0898b"
+        assert created_file.checksums == {
+            "md5": "746308829575e17c3331bbcb00c0898b",
+            "sha256": "d9014c4624844aa5bac314773d6b689ad467fa4e1d1a50a1b8a99d5a95f72ff5",
+        }
+        assert created_file.metadata == metadata
+        assert created_file.urls == {
+            "get": "https://api.replicate.com/v1/files/0ZjcyLWFhZjkNGZiNmY2YzQtMThhZi0tODg4NTY0NWNlMDEy",
+        }
+
+    finally:
+        os.unlink(temp_file_path)
+        os.rmdir(temp_dir)
+
 
 @skip_if_no_token
 @pytest.mark.skipif(os.environ.get("CI") is not None, reason="Do not run on CI")