Replace eacronym word ACS with Azure Communication Services

Author: Saisang

articles/communication-services/tutorials/chat-interop/meeting-interop-features-file-attachment.md

@@ -13,7 +13,7 @@ ms.custom: mode-other, devx-track-js
 
 # Tutorial: Enable file attachment support in your Chat app
 
-The Chat SDK is designed to work with Microsoft Teams seamlessly. Specifically, Chat SDK provides a solution to receive file attachments sent by users from Microsoft Teams. Currently this feature is only available in the Chat SDK for JavaScript. Please note that sending file attachments from ACS user to Teams user is not currently supported, see the current capabilities of [Teams Interop Chat](../../concepts/interop/guest/capabilities.md) for details.
+The Chat SDK is designed to work with Microsoft Teams seamlessly. Specifically, Chat SDK provides a solution to receive file attachments sent by users from Microsoft Teams. Currently this feature is only available in the Chat SDK for JavaScript. Please note that sending file attachments from Azure Communication Services user to Teams user is not currently supported, see the current capabilities of [Teams Interop Chat](../../concepts/interop/guest/capabilities.md) for details.
 
 [!INCLUDE [Public Preview Notice](../../includes/public-preview-include.md)]