diff --git a/xuqm-sdk/src/main/ets/core/Types.ets b/xuqm-sdk/src/main/ets/core/Types.ets
index 68dffdb..ebe2030 100644
--- a/xuqm-sdk/src/main/ets/core/Types.ets
+++ b/xuqm-sdk/src/main/ets/core/Types.ets
@@ -1,6 +1,5 @@
 export interface SDKConfig {
   appKey: string
-  appSecret: string
   debug: boolean
 }
 
diff --git a/xuqm-sdk/src/main/ets/im/ImClient.ets b/xuqm-sdk/src/main/ets/im/ImClient.ets
index ba72287..91f4cb4 100644
--- a/xuqm-sdk/src/main/ets/im/ImClient.ets
+++ b/xuqm-sdk/src/main/ets/im/ImClient.ets
@@ -1,7 +1,8 @@
 import webSocket from '@ohos.net.webSocket'
+import http from '@ohos.net.http'
 import { HttpClient } from '../core/HttpClient'
 import { SDKContext } from '../core/SDKContext'
-import { DEFAULT_IM_WS_URL } from '../core/Endpoints'
+import { DEFAULT_API_BASE_URL, DEFAULT_IM_WS_URL } from '../core/Endpoints'
 import type {
   ChatType,
   ConversationData,
@@ -23,6 +24,7 @@ export interface ImEventDelegate {
   onRead?(msg: ImMessage): void
   onRevoke?(data: RevokeData): void
   onError?(message: string): void
+  onConversationsChange?(conversations: ConversationData[]): void
 }
 
 export interface RevokeData {
@@ -155,8 +157,10 @@ export class ImClient {
             this.delegate?.onRevoke?.({ msgId: message.id, operatorId: message.fromId })
           }
           this.delegate?.onMessage?.(message)
+          this.notifyConversations()
         } else if (frame.type === 'REVOKE') {
           this.delegate?.onRevoke?.(frame.payload as RevokeData)
+          this.notifyConversations()
         }
       } catch {
         // ignore malformed frames
@@ -705,6 +709,80 @@ export class ImClient {
     return parts.join('&')
   }
 
+  async sendImageMessage(toId: string, chatType: ChatType, filePath: string, width?: number, height?: number): Promise<ImMessage> {
+    const uploadResult = await this.uploadFile(filePath)
+    const url = (uploadResult as Record<string, string>)['url'] ?? ''
+    const thumbnailUrl = (uploadResult as Record<string, string>)['thumbnailUrl']
+    const contentObj: Record<string, unknown> = { url }
+    if (width !== undefined) contentObj.width = width
+    if (height !== undefined) contentObj.height = height
+    if (thumbnailUrl) contentObj.thumbnailUrl = thumbnailUrl
+    return this.send({ toId, chatType, msgType: 'IMAGE', content: JSON.stringify(contentObj) })
+  }
+
+  async sendVideoMessage(toId: string, chatType: ChatType, filePath: string, width?: number, height?: number, duration?: number): Promise<ImMessage> {
+    const uploadResult = await this.uploadFile(filePath)
+    const url = (uploadResult as Record<string, string>)['url'] ?? ''
+    const thumbnailUrl = (uploadResult as Record<string, string>)['thumbnailUrl']
+    const contentObj: Record<string, unknown> = { url }
+    if (width !== undefined) contentObj.width = width
+    if (height !== undefined) contentObj.height = height
+    if (duration !== undefined) contentObj.duration = duration
+    if (thumbnailUrl) contentObj.thumbnailUrl = thumbnailUrl
+    return this.send({ toId, chatType, msgType: 'VIDEO', content: JSON.stringify(contentObj) })
+  }
+
+  async sendFileMessage(toId: string, chatType: ChatType, filePath: string): Promise<ImMessage> {
+    const uploadResult = await this.uploadFile(filePath)
+    const url = (uploadResult as Record<string, string>)['url'] ?? ''
+    const name = (uploadResult as Record<string, string>)['originalName'] ?? ''
+    const size = (uploadResult as Record<string, number>)['size'] ?? 0
+    const contentObj: Record<string, unknown> = { url, name, size }
+    return this.send({ toId, chatType, msgType: 'FILE', content: JSON.stringify(contentObj) })
+  }
+
+  async sendAudioMessage(toId: string, chatType: ChatType, filePath: string, duration?: number): Promise<ImMessage> {
+    const uploadResult = await this.uploadFile(filePath)
+    const url = (uploadResult as Record<string, string>)['url'] ?? ''
+    const contentObj: Record<string, unknown> = { url }
+    if (duration !== undefined) contentObj.duration = duration
+    return this.send({ toId, chatType, msgType: 'AUDIO', content: JSON.stringify(contentObj) })
+  }
+
+  private async uploadFile(filePath: string): Promise<Object> {
+    const token = SDKContext.getToken()
+    const url = DEFAULT_API_BASE_URL.replace(/\/$/, '') + '/api/file/upload'
+    const client = http.createHttp()
+    try {
+      const header: Record<string, string> = {}
+      if (token) header.Authorization = 'Bearer ' + token
+      const multipartForm = new http.MultipartForm()
+      multipartForm.addFile('file', filePath, filePath.substring(filePath.lastIndexOf('/') + 1))
+      const options: http.HttpRequestOptions = {
+        method: http.RequestMethod.POST,
+        header,
+        extraData: multipartForm,
+        connectTimeout: 60000,
+        readTimeout: 60000,
+      }
+      const res = await client.request(url, options)
+      const json = JSON.parse(res.result as string) as { code: number; message: string; data: Object }
+      if (json.code !== 200) throw new Error(json.message)
+      return json.data
+    } finally {
+      client.destroy()
+    }
+  }
+
+  private async notifyConversations(): Promise<void> {
+    try {
+      const conversations = await this.listConversations()
+      this.delegate?.onConversationsChange?.(conversations)
+    } catch {
+      // ignore
+    }
+  }
+
   disconnect(): void {
     this.destroyed = true
     if (this.reconnectTimer !== null) {