diff --git a/litellm/tests/test_file_types.py b/litellm/tests/test_file_types.py
new file mode 100644
index 00000000000..db83ba0e74b
--- /dev/null
+++ b/litellm/tests/test_file_types.py
@@ -0,0 +1,54 @@
+from litellm.types.files import (
+    FILE_EXTENSIONS,
+    FILE_MIME_TYPES,
+    FileType,
+    get_file_extension_from_mime_type,
+    get_file_type_from_extension,
+    get_file_extension_for_file_type,
+    get_file_mime_type_for_file_type,
+    get_file_mime_type_from_extension,
+)
+import pytest
+
+
+class TestFileConsts:
+    def test_all_file_types_have_extensions(self):
+        for file_type in FileType:
+            assert file_type in FILE_EXTENSIONS.keys()
+
+    def test_all_file_types_have_mime_types(self):
+        for file_type in FileType:
+            assert file_type in FILE_MIME_TYPES.keys()
+
+    def test_get_file_extension_from_mime_type(self):
+        assert get_file_extension_from_mime_type("audio/aac") == "aac"
+        assert get_file_extension_from_mime_type("application/pdf") == "pdf"
+        with pytest.raises(ValueError):
+            get_file_extension_from_mime_type("application/unknown")
+
+    def test_get_file_type_from_extension(self):
+        assert get_file_type_from_extension("aac") == FileType.AAC
+        assert get_file_type_from_extension("pdf") == FileType.PDF
+        with pytest.raises(ValueError):
+            get_file_type_from_extension("unknown")
+
+    def test_get_file_extension_for_file_type(self):
+        assert get_file_extension_for_file_type(FileType.AAC) == "aac"
+        assert get_file_extension_for_file_type(FileType.PDF) == "pdf"
+
+    def test_get_file_mime_type_for_file_type(self):
+        assert get_file_mime_type_for_file_type(FileType.AAC) == "audio/aac"
+        assert get_file_mime_type_for_file_type(FileType.PDF) == "application/pdf"
+
+    def test_get_file_mime_type_from_extension(self):
+        assert get_file_mime_type_from_extension("aac") == "audio/aac"
+        assert get_file_mime_type_from_extension("pdf") == "application/pdf"
+
+    def test_uppercase_extensions(self):
+        # Test that uppercase extensions return the correct file type
+        assert get_file_type_from_extension("AAC") == FileType.AAC
+        assert get_file_type_from_extension("PDF") == FileType.PDF
+
+        # Test that uppercase extensions return the correct MIME type
+        assert get_file_mime_type_from_extension("AAC") == "audio/aac"
+        assert get_file_mime_type_from_extension("PDF") == "application/pdf"
diff --git a/litellm/types/files.py b/litellm/types/files.py
index 2da08e76c4d..577b9b55cc1 100644
--- a/litellm/types/files.py
+++ b/litellm/types/files.py
@@ -151,23 +151,16 @@ Util Functions
 """
 
 
-def get_file_mime_type_from_extension(extension: str) -> str:
-    for file_type, extensions in FILE_EXTENSIONS.items():
-        if extension in extensions:
-            return FILE_MIME_TYPES[file_type]
-    raise ValueError(f"Unknown mime type for extension: {extension}")
-
-
 def get_file_extension_from_mime_type(mime_type: str) -> str:
     for file_type, mime in FILE_MIME_TYPES.items():
-        if mime == mime_type:
+        if mime.lower() == mime_type.lower():
             return FILE_EXTENSIONS[file_type][0]
     raise ValueError(f"Unknown extension for mime type: {mime_type}")
 
 
 def get_file_type_from_extension(extension: str) -> FileType:
     for file_type, extensions in FILE_EXTENSIONS.items():
-        if extension in extensions:
+        if extension.lower() in extensions:
             return file_type
 
     raise ValueError(f"Unknown file type for extension: {extension}")
@@ -181,6 +174,11 @@ def get_file_mime_type_for_file_type(file_type: FileType) -> str:
     return FILE_MIME_TYPES[file_type]
 
 
+def get_file_mime_type_from_extension(extension: str) -> str:
+    file_type = get_file_type_from_extension(extension)
+    return get_file_mime_type_for_file_type(file_type)
+
+
 """
 FileType Type Groupings (Videos, Images, etc)
 """