diff --git a/package-lock.json b/package-lock.json
index f0cfac7..b7ea607 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "@huggingface/transformers": "^4.2.0",
         "@imgly/background-removal": "^1.7.0",
         "@insignia/iios-kernel-client": "^0.1.4",
-        "@insignia/iios-messaging-ui": "^0.1.7",
+        "@insignia/iios-messaging-ui": "^0.1.8",
         "@photo-gallery/sdk": "file:./vendor/photo-gallery-sdk",
         "@tensorflow-models/coco-ssd": "^2.2.3",
         "@tensorflow/tfjs": "^4.22.0",
@@ -1087,9 +1087,9 @@
       }
     },
     "node_modules/@insignia/iios-messaging-ui": {
-      "version": "0.1.7",
-      "resolved": "https://git.lynkedup.cloud/api/packages/insignia/npm/%40insignia%2Fiios-messaging-ui/-/0.1.7/iios-messaging-ui-0.1.7.tgz",
-      "integrity": "sha512-ZE4fLeSTSa5AFZnvSRT7G/TEaw+Jm5qH8rWaDjns6Vu9zBnDTVYdF8CMEisBrtgSDj+jDQBo9xlwZmr++5qehw==",
+      "version": "0.1.8",
+      "resolved": "https://git.lynkedup.cloud/api/packages/insignia/npm/%40insignia%2Fiios-messaging-ui/-/0.1.8/iios-messaging-ui-0.1.8.tgz",
+      "integrity": "sha512-djLQtX69f8p/2v7m2qhDU7AjCsvt3mz8qzTqf7CSTVsFu1mzMZTLfdq7e4DJzZ0syw76Rhzqrhw+RysiQEpDCg==",
       "peerDependencies": {
         "@insignia/iios-kernel-client": "*",
         "react": ">=18",
diff --git a/package.json b/package.json
index 83f029c..2ed2a6d 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "@huggingface/transformers": "^4.2.0",
     "@imgly/background-removal": "^1.7.0",
     "@insignia/iios-kernel-client": "^0.1.4",
-    "@insignia/iios-messaging-ui": "^0.1.7",
+    "@insignia/iios-messaging-ui": "^0.1.8",
     "@photo-gallery/sdk": "file:./vendor/photo-gallery-sdk",
     "@tensorflow-models/coco-ssd": "^2.2.3",
     "@tensorflow/tfjs": "^4.22.0",
diff --git a/src/lib/crm-messaging-adapter.ts b/src/lib/crm-messaging-adapter.ts
index 791b3b6..f1c4aca 100644
--- a/src/lib/crm-messaging-adapter.ts
+++ b/src/lib/crm-messaging-adapter.ts
@@ -7,6 +7,7 @@
 
 import type {
   Attachment,
+  BulkAddResult,
   ChannelSummary,
   ChannelVisibility,
   Conversation,
@@ -247,6 +248,12 @@ export class CrmMessagingAdapter implements MessagingAdapter {
     await this.sdk.command("crm.messenger.participant.add", { threadId, userId });
   }
 
+  /** Bulk import (e.g. everyone from another channel). IIOS governs both ends: you must belong to
+   *  the source channel to read its roster, and OPA re-checks who may add to this thread. */
+  async addMembers(threadId: string, userIds: string[]): Promise<BulkAddResult> {
+    return this.sdk.command<BulkAddResult>("crm.messenger.participant.addMany", { threadId, userIds });
+  }
+
   async removeMember(threadId: string, userId: string): Promise<void> {
     await this.sdk.command("crm.messenger.participant.remove", { threadId, userId });
   }