diff --git a/ariadne/contrib/tracing/copy_args.py b/ariadne/contrib/tracing/copy_args.py
index 474ce51d..3c295a4a 100644
--- a/ariadne/contrib/tracing/copy_args.py
+++ b/ariadne/contrib/tracing/copy_args.py
@@ -22,8 +22,9 @@ def copy_args_for_tracing(value: Any) -> Any:
 
 
 def repr_upload_file(upload_file: Union[UploadFile, File]) -> str:
+    filename: Union[str, None]
     if isinstance(upload_file, File):
-        filename = upload_file.file_name
+        filename = upload_file.file_name.decode() if upload_file.file_name else None
     else:
         filename = upload_file.filename
 
diff --git a/ariadne/contrib/tracing/utils.py b/ariadne/contrib/tracing/utils.py
index ad79c945..d92dcb4d 100644
--- a/ariadne/contrib/tracing/utils.py
+++ b/ariadne/contrib/tracing/utils.py
@@ -25,8 +25,9 @@ def copy_args_for_tracing(value: Any) -> Any:
 
 
 def repr_upload_file(upload_file: Union[UploadFile, File]) -> str:
+    filename: Union[str, None]
     if isinstance(upload_file, File):
-        filename = upload_file.file_name
+        filename = upload_file.file_name.decode() if upload_file.file_name else None
     else:
         filename = upload_file.filename
 
diff --git a/ariadne/load_schema.py b/ariadne/load_schema.py
index 43fdfd8b..dac3bc8b 100644
--- a/ariadne/load_schema.py
+++ b/ariadne/load_schema.py
@@ -1,4 +1,5 @@
 import os
+from pathlib import Path
 from typing import Generator, Union
 
 from graphql import parse
@@ -27,7 +28,7 @@ def load_schema_from_path(path: Union[str, os.PathLike]) -> str:
     if os.path.isdir(path):
         schema_list = [read_graphql_file(f) for f in sorted(walk_graphql_files(path))]
         return "\n".join(schema_list)
-    return read_graphql_file(os.path.abspath(path))
+    return read_graphql_file(Path(path).resolve())
 
 
 def walk_graphql_files(path: Union[str, os.PathLike]) -> Generator[str, None, None]:
diff --git a/ariadne/wsgi.py b/ariadne/wsgi.py
index 8a185d79..ec652b0f 100644
--- a/ariadne/wsgi.py
+++ b/ariadne/wsgi.py
@@ -40,7 +40,7 @@
     from multipart import parse_form
 except ImportError:
 
-    def parse_form(*_args, **_kwargs):
+    def parse_form(*_args, **_kwargs):  # type: ignore
         raise NotImplementedError(
             "WSGI file uploads requires 'python-multipart' library."
         )
@@ -668,8 +668,11 @@ def parse_multipart_request(environ: dict) -> "FormData":
     headers = {"Content-Type": content_type}
     form_data = FormData(content_type)
 
+    # Silence mypy error for this incorrect type.
+    # parse_fprm defines the type as dict[str, bytes] but works with
+    # dict[str, Optional[str | bytes]] and will throw ValueError if Content-Type is None.
     parse_form(
-        headers,
+        headers,  # type: ignore
         environ["wsgi.input"],
         form_data.on_field,
         form_data.on_file,