diff --git a/src/google/adk/models/lite_llm.py b/src/google/adk/models/lite_llm.py
index 5f374dc2ad..f1856156b2 100644
--- a/src/google/adk/models/lite_llm.py
+++ b/src/google/adk/models/lite_llm.py
@@ -79,6 +79,10 @@
     "content_filter": types.FinishReason.SAFETY,
 }
 
+_SUPPORTED_FILE_CONTENT_MIME_TYPES = set(
+    ["application/pdf", "application/json", "text/plain"]
+)
+
 
 class ChatCompletionFileUrlObject(TypedDict, total=False):
   file_data: str
@@ -336,7 +340,7 @@ def _get_content(
             "type": "audio_url",
             "audio_url": {"url": data_uri, "format": format_type},
         })
-      elif part.inline_data.mime_type == "application/pdf":
+      elif part.inline_data.mime_type in _SUPPORTED_FILE_CONTENT_MIME_TYPES:
         format_type = part.inline_data.mime_type
         content_objects.append({
             "type": "file",
diff --git a/tests/unittests/models/test_litellm.py b/tests/unittests/models/test_litellm.py
index 1e1d47002d..c60d7fb20e 100644
--- a/tests/unittests/models/test_litellm.py
+++ b/tests/unittests/models/test_litellm.py
@@ -87,6 +87,32 @@
     ),
 )
 
+FILE_URI_TEST_CASES = [
+    pytest.param("gs://bucket/document.pdf", "application/pdf", id="pdf"),
+    pytest.param("gs://bucket/data.json", "application/json", id="json"),
+    pytest.param("gs://bucket/data.txt", "text/plain", id="txt"),
+]
+
+FILE_BYTES_TEST_CASES = [
+    pytest.param(
+        b"test_pdf_data",
+        "application/pdf",
+        "data:application/pdf;base64,dGVzdF9wZGZfZGF0YQ==",
+        id="pdf",
+    ),
+    pytest.param(
+        b'{"hello":"world"}',
+        "application/json",
+        "data:application/json;base64,eyJoZWxsbyI6IndvcmxkIn0=",
+        id="json",
+    ),
+    pytest.param(
+        b"hello world",
+        "text/plain",
+        "data:text/plain;base64,aGVsbG8gd29ybGQ=",
+        id="txt",
+    ),
+]
 
 STREAMING_MODEL_RESPONSE = [
     ModelResponse(
@@ -1088,10 +1114,11 @@ def test_content_to_message_param_user_message():
   assert message["content"] == "Test prompt"
 
 
-def test_content_to_message_param_user_message_with_file_uri():
-  file_part = types.Part.from_uri(
-      file_uri="gs://bucket/document.pdf", mime_type="application/pdf"
-  )
+@pytest.mark.parametrize("file_uri,mime_type", FILE_URI_TEST_CASES)
+def test_content_to_message_param_user_message_with_file_uri(
+    file_uri, mime_type
+):
+  file_part = types.Part.from_uri(file_uri=file_uri, mime_type=mime_type)
   content = types.Content(
       role="user",
       parts=[
@@ -1106,14 +1133,15 @@ def test_content_to_message_param_user_message_with_file_uri():
   assert message["content"][0]["type"] == "text"
   assert message["content"][0]["text"] == "Summarize this file."
   assert message["content"][1]["type"] == "file"
-  assert message["content"][1]["file"]["file_id"] == "gs://bucket/document.pdf"
-  assert message["content"][1]["file"]["format"] == "application/pdf"
+  assert message["content"][1]["file"]["file_id"] == file_uri
+  assert message["content"][1]["file"]["format"] == mime_type
 
 
-def test_content_to_message_param_user_message_file_uri_only():
-  file_part = types.Part.from_uri(
-      file_uri="gs://bucket/only.pdf", mime_type="application/pdf"
-  )
+@pytest.mark.parametrize("file_uri,mime_type", FILE_URI_TEST_CASES)
+def test_content_to_message_param_user_message_file_uri_only(
+    file_uri, mime_type
+):
+  file_part = types.Part.from_uri(file_uri=file_uri, mime_type=mime_type)
   content = types.Content(
       role="user",
       parts=[
@@ -1125,8 +1153,8 @@ def test_content_to_message_param_user_message_file_uri_only():
   assert message["role"] == "user"
   assert isinstance(message["content"], list)
   assert message["content"][0]["type"] == "file"
-  assert message["content"][0]["file"]["file_id"] == "gs://bucket/only.pdf"
-  assert message["content"][0]["file"]["format"] == "application/pdf"
+  assert message["content"][0]["file"]["file_id"] == file_uri
+  assert message["content"][0]["file"]["format"] == mime_type
 
 
 def test_content_to_message_param_multi_part_function_response():
@@ -1294,30 +1322,24 @@ def test_get_content_video():
   assert content[0]["video_url"]["format"] == "video/mp4"
 
 
-def test_get_content_pdf():
-  parts = [
-      types.Part.from_bytes(data=b"test_pdf_data", mime_type="application/pdf")
-  ]
+@pytest.mark.parametrize(
+    "file_data,mime_type,expected_base64", FILE_BYTES_TEST_CASES
+)
+def test_get_content_file_bytes(file_data, mime_type, expected_base64):
+  parts = [types.Part.from_bytes(data=file_data, mime_type=mime_type)]
   content = _get_content(parts)
   assert content[0]["type"] == "file"
-  assert (
-      content[0]["file"]["file_data"]
-      == "data:application/pdf;base64,dGVzdF9wZGZfZGF0YQ=="
-  )
-  assert content[0]["file"]["format"] == "application/pdf"
+  assert content[0]["file"]["file_data"] == expected_base64
+  assert content[0]["file"]["format"] == mime_type
 
 
-def test_get_content_file_uri():
-  parts = [
-      types.Part.from_uri(
-          file_uri="gs://bucket/document.pdf",
-          mime_type="application/pdf",
-      )
-  ]
+@pytest.mark.parametrize("file_uri,mime_type", FILE_URI_TEST_CASES)
+def test_get_content_file_uri(file_uri, mime_type):
+  parts = [types.Part.from_uri(file_uri=file_uri, mime_type=mime_type)]
   content = _get_content(parts)
   assert content[0]["type"] == "file"
-  assert content[0]["file"]["file_id"] == "gs://bucket/document.pdf"
-  assert content[0]["file"]["format"] == "application/pdf"
+  assert content[0]["file"]["file_id"] == file_uri
+  assert content[0]["file"]["format"] == mime_type
 
 
 def test_get_content_audio():