diff --git a/rohmu/errors.py b/rohmu/errors.py
index 3e2e1443..72175043 100644
--- a/rohmu/errors.py
+++ b/rohmu/errors.py
@@ -44,3 +44,7 @@ class InvalidByteRangeError(Error):
 
 class InvalidTransferError(Error):
     """You tried to access a transfer object that you already returned to the pool"""
+
+
+class ConcurrentUploadError(StorageError):
+    """A generic error related to concurrent uploads"""
diff --git a/rohmu/object_storage/local.py b/rohmu/object_storage/local.py
index f2ef619c..77c1a652 100644
--- a/rohmu/object_storage/local.py
+++ b/rohmu/object_storage/local.py
@@ -9,7 +9,7 @@
 
 from ..common.models import StorageModel, StorageOperation
 from ..common.statsd import StatsdConfig
-from ..errors import FileNotFoundFromStorageError, StorageError
+from ..errors import ConcurrentUploadError, FileNotFoundFromStorageError
 from ..notifier.interface import Notifier
 from ..typing import Metadata
 from ..util import BinaryStreamsConcatenation, ProgressStream
@@ -260,7 +260,10 @@ def create_concurrent_upload(
         upload_id = uuid.uuid4().hex
         upload = ConcurrentUpload("local", upload_id, key, metadata, {})
         chunks_dir = self._get_chunks_dir(upload)
-        os.makedirs(chunks_dir, exist_ok=True)
+        try:
+            os.makedirs(chunks_dir, exist_ok=True)
+        except OSError as ex:
+            raise ConcurrentUploadError("Failed to initiate multipart upload for {}".format(key)) from ex
         self.stats.operation(StorageOperation.create_multipart_upload)
         return upload
 
@@ -283,7 +286,7 @@ def upload_concurrent_chunk(
             self.stats.operation(StorageOperation.store_file, size=bytes_read)
             upload.chunks_to_etags[chunk_number] = "no-etag"
         except OSError as ex:
-            raise StorageError(
+            raise ConcurrentUploadError(
                 "Failed to upload chunk {} of multipart upload for {}".format(chunk_number, upload.key)
             ) from ex
 
@@ -297,7 +300,7 @@ def complete_concurrent_upload(self, upload: ConcurrentUpload) -> None:
             chunk_files = (open(os.path.join(chunks_dir, chunk_file), "rb") for chunk_file in chunk_filenames)
             stream = BinaryStreamsConcatenation(chunk_files)
         except OSError as ex:
-            raise StorageError("Failed to complete multipart upload for {}".format(upload.key)) from ex
+            raise ConcurrentUploadError("Failed to complete multipart upload for {}".format(upload.key)) from ex
         self.store_file_object(
             upload.key,
             stream,  # type: ignore[arg-type]
@@ -313,7 +316,7 @@ def abort_concurrent_upload(self, upload: ConcurrentUpload) -> None:
         try:
             shutil.rmtree(chunks_dir)
         except OSError as ex:
-            raise StorageError("Failed to abort multipart upload for {}".format(upload.key)) from ex
+            raise ConcurrentUploadError("Failed to abort multipart upload for {}".format(upload.key)) from ex
 
     def _get_chunks_dir(self, upload: ConcurrentUpload) -> str:
         return self.format_key_for_backend(".concurrent_upload_" + upload.backend_id)
diff --git a/rohmu/object_storage/s3.py b/rohmu/object_storage/s3.py
index 99313c26..1010c3e6 100644
--- a/rohmu/object_storage/s3.py
+++ b/rohmu/object_storage/s3.py
@@ -10,7 +10,7 @@
 
 from ..common.models import ProxyInfo, StorageModel, StorageOperation
 from ..common.statsd import StatsdConfig
-from ..errors import FileNotFoundFromStorageError, InvalidConfigurationError, StorageError
+from ..errors import ConcurrentUploadError, FileNotFoundFromStorageError, InvalidConfigurationError, StorageError
 from ..notifier.interface import Notifier
 from ..typing import Metadata
 from .base import (
@@ -597,7 +597,7 @@ def create_concurrent_upload(
         try:
             cmu_response = self.s3_client.create_multipart_upload(**args)
         except botocore.exceptions.ClientError as ex:
-            raise StorageError("Failed to initiate multipart upload for {}".format(path)) from ex
+            raise ConcurrentUploadError("Failed to initiate multipart upload for {}".format(path)) from ex
 
         return ConcurrentUpload("aws", cmu_response["UploadId"], key, metadata, {})
 
@@ -617,7 +617,7 @@ def complete_concurrent_upload(self, upload: ConcurrentUpload) -> None:
                 RequestPayer="requester",
             )
         except botocore.exceptions.ClientError as ex:
-            raise StorageError("Failed to complete multipart upload for {}".format(upload.key)) from ex
+            raise ConcurrentUploadError("Failed to complete multipart upload for {}".format(upload.key)) from ex
 
     def abort_concurrent_upload(self, upload: ConcurrentUpload) -> None:
         backend_key = self.format_key_for_backend(upload.key, remove_slash_prefix=True)
@@ -630,7 +630,7 @@ def abort_concurrent_upload(self, upload: ConcurrentUpload) -> None:
                 RequestPayer="requester",
             )
         except botocore.exceptions.ClientError as ex:
-            raise StorageError("Failed to abort multipart upload for {}".format(upload.key)) from ex
+            raise ConcurrentUploadError("Failed to abort multipart upload for {}".format(upload.key)) from ex
 
     def upload_concurrent_chunk(
         self,
@@ -661,7 +661,7 @@ def upload_concurrent_chunk(
             self.stats.operation(StorageOperation.store_file, size=body.bytes_read)
             upload.chunks_to_etags[chunk_number] = response["ETag"]
         except botocore.exceptions.ClientError as ex:
-            raise StorageError(
+            raise ConcurrentUploadError(
                 "Failed to upload chunk {} of multipart upload for {}".format(chunk_number, upload.key)
             ) from ex