diff --git a/packages/aws-amplify/package.json b/packages/aws-amplify/package.json
index 889d7112966..1d10721644d 100644
--- a/packages/aws-amplify/package.json
+++ b/packages/aws-amplify/package.json
@@ -497,7 +497,7 @@
 			"name": "[Storage] uploadData (S3)",
 			"path": "./dist/esm/storage/index.mjs",
 			"import": "{ uploadData }",
-			"limit": "22.35 kB"
+			"limit": "22.39 kB"
 		}
 	]
 }
diff --git a/packages/storage/__tests__/providers/s3/apis/uploadData/multipartHandlers.test.ts b/packages/storage/__tests__/providers/s3/apis/uploadData/multipartHandlers.test.ts
index a56ee30c1e5..06771dce52e 100644
--- a/packages/storage/__tests__/providers/s3/apis/uploadData/multipartHandlers.test.ts
+++ b/packages/storage/__tests__/providers/s3/apis/uploadData/multipartHandlers.test.ts
@@ -593,7 +593,6 @@ describe('getMultipartUploadHandlers with key', () => {
 		});
 
 		it('should cache the upload with file including file lastModified property', async () => {
-			// mockCalculateContentCRC32Mock();
 			mockMultipartUploadSuccess();
 			mockListParts.mockResolvedValueOnce({ Parts: [], $metadata: {} });
 			const size = 8 * MB;
diff --git a/packages/storage/src/providers/s3/apis/internal/uploadData/index.ts b/packages/storage/src/providers/s3/apis/internal/uploadData/index.ts
index 602fcab83e7..68d428c0b55 100644
--- a/packages/storage/src/providers/s3/apis/internal/uploadData/index.ts
+++ b/packages/storage/src/providers/s3/apis/internal/uploadData/index.ts
@@ -1,7 +1,6 @@
 // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
-// TODO: Remove this interface when we move to public advanced APIs.
 import { createUploadTask } from '../../../utils';
 import { assertValidationError } from '../../../../../errors/utils/assertValidationError';
 import { StorageValidationErrorCode } from '../../../../../errors/types/validation';
diff --git a/packages/storage/src/providers/s3/apis/internal/uploadData/multipart/uploadHandlers.ts b/packages/storage/src/providers/s3/apis/internal/uploadData/multipart/uploadHandlers.ts
index 42988f2b3ce..c23d2cc5052 100644
--- a/packages/storage/src/providers/s3/apis/internal/uploadData/multipart/uploadHandlers.ts
+++ b/packages/storage/src/providers/s3/apis/internal/uploadData/multipart/uploadHandlers.ts
@@ -47,6 +47,16 @@ import { getDataChunker } from './getDataChunker';
 type WithResumableCacheConfig<Input extends StorageOperationOptionsInput<any>> =
 	Input & {
 		options?: Input['options'] & {
+			/**
+			 * The cache instance to store the in-progress multipart uploads so they can be resumed
+			 * after page refresh. By default the library caches the uploaded file name,
+			 * last modified, final checksum, size, bucket, key, and corresponded in-progress
+			 * multipart upload ID from S3. If the library detects the same input corresponds to a
+			 * previously in-progress upload from within 1 hour ago, it will continue
+			 * the upload from where it left.
+			 *
+			 * By default, this option is not set. The upload caching is disabled.
+			 */
 			resumableUploadsCache?: KeyValueStorageInterface;
 		};
 	};
@@ -55,6 +65,7 @@ type WithResumableCacheConfig<Input extends StorageOperationOptionsInput<any>> =
  * The input interface for UploadData API with the options needed for multi-part upload.
  * It supports both legacy Gen 1 input with key and Gen2 input with path. It also support additional
  * advanced options for StorageBrowser.
+ *
  * @internal
  */
 export type MultipartUploadDataInput = WithResumableCacheConfig<
diff --git a/packages/storage/src/providers/s3/apis/uploadData.ts b/packages/storage/src/providers/s3/apis/uploadData.ts
index 5739109e7b8..b6173d3777e 100644
--- a/packages/storage/src/providers/s3/apis/uploadData.ts
+++ b/packages/storage/src/providers/s3/apis/uploadData.ts
@@ -9,7 +9,6 @@ import {
 	UploadDataWithPathInput,
 	UploadDataWithPathOutput,
 } from '../types';
-// import { isDeprecatedInput } from '../utils/isDeprecatedInput';
 
 import { uploadData as uploadDataInternal } from './internal/uploadData';
 
@@ -128,6 +127,8 @@ export function uploadData(input: UploadDataInput | UploadDataWithPathInput) {
 		...input,
 		options: {
 			...input?.options,
+			// This option enables caching in-progress multipart uploads.
+			// It's ONLY needed for client-side API.
 			resumableUploadsCache: defaultStorage,
 		},
 	});
diff --git a/packages/storage/src/providers/s3/utils/isDeprecatedInput.ts b/packages/storage/src/providers/s3/utils/isDeprecatedInput.ts
deleted file mode 100644
index aca27bbd658..00000000000
--- a/packages/storage/src/providers/s3/utils/isDeprecatedInput.ts
+++ /dev/null
@@ -1,51 +0,0 @@
-// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-import {
-	StorageOperationInputWithKey,
-	StorageOperationInputWithPath,
-	StorageOperationInputWithPrefix,
-} from '../../../types/inputs';
-import { CopyInput, CopyWithPathInput } from '../types';
-
-export type StorageWithPathInput =
-	| StorageOperationInputWithPath
-	| CopyWithPathInput;
-
-export type DeprecatedStorageInput =
-	| StorageOperationInputWithKey
-	| StorageOperationInputWithPrefix
-	| CopyInput;
-
-type StorageInput = DeprecatedStorageInput | StorageWithPathInput;
-
-export const isDeprecatedInput = (
-	input?: StorageInput,
-): input is DeprecatedStorageInput => {
-	return (
-		isInputWithKey(input) ||
-		isInputWithPrefix(input) ||
-		isInputWithCopySourceOrDestination(input)
-	);
-};
-
-const isInputWithKey = (
-	input?: StorageInput,
-): input is StorageOperationInputWithKey => {
-	return !!(typeof (input as StorageOperationInputWithKey).key === 'string');
-};
-const isInputWithPrefix = (
-	input?: StorageInput,
-): input is StorageOperationInputWithPrefix => {
-	return !!(
-		typeof (input as StorageOperationInputWithPrefix).prefix === 'string'
-	);
-};
-const isInputWithCopySourceOrDestination = (
-	input?: StorageInput,
-): input is CopyInput => {
-	return !!(
-		typeof (input as CopyInput).source?.key === 'string' ||
-		typeof (input as CopyInput).destination?.key === 'string'
-	);
-};