diff --git a/src/nipanel/_convert.py b/src/nipanel/_convert.py
index 8ea2b68..3b934fe 100644
--- a/src/nipanel/_convert.py
+++ b/src/nipanel/_convert.py
@@ -2,11 +2,13 @@
 
 from __future__ import annotations
 
+import enum
 import logging
 from collections.abc import Collection
 from typing import Any, Iterable
 
 from google.protobuf import any_pb2
+from nitypes.vector import Vector
 from nitypes.waveform import AnalogWaveform, ComplexWaveform
 
 from nipanel.converters import Converter
@@ -73,17 +75,18 @@
     VectorConverter(),
 ]
 
-_CONVERTIBLE_COLLECTION_TYPES = {
-    frozenset,
-    list,
-    set,
-    tuple,
-}
-
 _CONVERTER_FOR_PYTHON_TYPE = {entry.python_typename: entry for entry in _CONVERTIBLE_TYPES}
 _CONVERTER_FOR_GRPC_TYPE = {entry.protobuf_typename: entry for entry in _CONVERTIBLE_TYPES}
 _SUPPORTED_PYTHON_TYPES = _CONVERTER_FOR_PYTHON_TYPE.keys()
 
+_SKIPPED_COLLECTIONS = (
+    str,  # Handled by StrConverter
+    bytes,  # Handled by BytesConverter
+    dict,  # Unsupported data type
+    enum.Enum,  # Handled by IntConverter
+    Vector,  # Handled by VectorConverter
+)
+
 
 def to_any(python_value: object) -> any_pb2.Any:
     """Convert a Python object to a protobuf Any."""
@@ -97,7 +100,7 @@ def _get_best_matching_type(python_value: object) -> str:
     additional_info_string = _get_additional_type_info_string(python_value)
 
     container_types = []
-    value_is_collection = any(_CONVERTIBLE_COLLECTION_TYPES.intersection(underlying_parents))
+    value_is_collection = _is_collection_for_convert(python_value)
     # Variable to use when traversing down through collection types.
     working_python_value = python_value
     while value_is_collection:
@@ -119,9 +122,7 @@ def _get_best_matching_type(python_value: object) -> str:
             # If this element is a collection, we want to continue traversing. Once we find a
             # non-collection, underlying_parents will refer to the candidates for the non-
             # collection type.
-            value_is_collection = any(
-                _CONVERTIBLE_COLLECTION_TYPES.intersection(underlying_parents)
-            )
+            value_is_collection = _is_collection_for_convert(working_python_value)
         container_types.append(Collection)
 
     best_matching_type = None
@@ -192,3 +193,9 @@ def _get_additional_type_info_string(python_value: object) -> str:
         return str(python_value.dtype)
     else:
         return ""
+
+
+def _is_collection_for_convert(python_value: object) -> bool:
+    return isinstance(python_value, Collection) and not isinstance(
+        python_value, _SKIPPED_COLLECTIONS
+    )