diff --git a/packages/service-clients/odsp-client/api-report/odsp-client.alpha.api.md b/packages/service-clients/odsp-client/api-report/odsp-client.alpha.api.md
index 8a0462d5c31d..9544d32aa15d 100644
--- a/packages/service-clients/odsp-client/api-report/odsp-client.alpha.api.md
+++ b/packages/service-clients/odsp-client/api-report/odsp-client.alpha.api.md
@@ -50,8 +50,10 @@ export interface OdspConnectionConfig {
 
 // @beta (undocumented)
 export interface OdspContainerAttachProps {
+    eTag?: string;
     fileName: string | undefined;
     filePath: string | undefined;
+    itemId?: string;
 }
 
 // @beta
diff --git a/packages/service-clients/odsp-client/api-report/odsp-client.beta.api.md b/packages/service-clients/odsp-client/api-report/odsp-client.beta.api.md
index fc893e97c251..afdf03485e13 100644
--- a/packages/service-clients/odsp-client/api-report/odsp-client.beta.api.md
+++ b/packages/service-clients/odsp-client/api-report/odsp-client.beta.api.md
@@ -50,8 +50,10 @@ export interface OdspConnectionConfig {
 
 // @beta (undocumented)
 export interface OdspContainerAttachProps {
+    eTag?: string;
     fileName: string | undefined;
     filePath: string | undefined;
+    itemId?: string;
 }
 
 // @beta
diff --git a/packages/service-clients/odsp-client/src/interfaces.ts b/packages/service-clients/odsp-client/src/interfaces.ts
index 2096dd4333d7..20359d685e82 100644
--- a/packages/service-clients/odsp-client/src/interfaces.ts
+++ b/packages/service-clients/odsp-client/src/interfaces.ts
@@ -77,6 +77,18 @@ export interface OdspContainerAttachProps {
 	 * The file name of the Fluid file. If undefined, the file is named with a GUID.
 	 */
 	fileName: string | undefined;
+
+	/**
+	 * The ID of the item (file) to which the container is being attached.
+	 * When combined with eTag, this will trigger a conversion of an existing file to a Fluid file.
+	 */
+	itemId?: string;
+
+	/**
+	 * Optional eTag to use when attaching the container.
+	 * If provided, the container will
+	 */
+	eTag?: string;
 }
 
 /**
diff --git a/packages/service-clients/odsp-client/src/odspClient.ts b/packages/service-clients/odsp-client/src/odspClient.ts
index 44459bd74d50..3ddbcee21792 100644
--- a/packages/service-clients/odsp-client/src/odspClient.ts
+++ b/packages/service-clients/odsp-client/src/odspClient.ts
@@ -202,12 +202,25 @@ export class OdspClient {
 		const attach = async (
 			odspProps?: ContainerAttachProps<OdspContainerAttachProps>,
 		): Promise<string> => {
-			const createNewRequest: IRequest = createOdspCreateContainerRequest(
-				connection.siteUrl,
-				connection.driveId,
-				odspProps?.filePath ?? "",
-				odspProps?.fileName ?? uuid(),
-			);
+			const createNewRequest: IRequest =
+				odspProps?.eTag !== undefined && odspProps?.itemId !== undefined
+					? {
+							url: createOdspUrl({
+								siteUrl: connection.siteUrl,
+								driveId: connection.driveId,
+								itemId: odspProps.itemId,
+								dataStorePath: "",
+							}),
+							headers: {
+								eTag: odspProps.eTag,
+							},
+						}
+					: createOdspCreateContainerRequest(
+							connection.siteUrl,
+							connection.driveId,
+							odspProps?.filePath ?? "",
+							odspProps?.fileName ?? uuid(),
+						);
 			if (container.attachState !== AttachState.Detached) {
 				throw new Error("Cannot attach container. Container is not in detached state");
 			}