diff --git a/apps/chat/src/store/publication/publication.epics.ts b/apps/chat/src/store/publication/publication.epics.ts
index 4546990bb9..f889fffc16 100644
--- a/apps/chat/src/store/publication/publication.epics.ts
+++ b/apps/chat/src/store/publication/publication.epics.ts
@@ -18,6 +18,7 @@ import { AnyAction } from '@reduxjs/toolkit';
 
 import { combineEpics } from 'redux-observable';
 
+import { BucketService } from '@/src/utils/app/data/bucket-service';
 import { ConversationService } from '@/src/utils/app/data/conversation-service';
 import { PromptService } from '@/src/utils/app/data/prompt-service';
 import { PublicationService } from '@/src/utils/app/data/publication-service';
@@ -86,6 +87,25 @@ const publishEpic: AppEpic = (action$) =>
   action$.pipe(
     filter(PublicationActions.publish.match),
     switchMap(({ payload }) => {
+      const fileIds = payload.resources
+        .map(({ sourceUrl }) => sourceUrl)
+        .filter((id) => id && isFileId(id));
+      const userBucket = BucketService.getBucket();
+
+      const isPublishingExternalFiles = fileIds.some((id) => {
+        const { bucket: fileBucket } = splitEntityId(id as string);
+
+        return fileBucket !== userBucket;
+      });
+
+      if (isPublishingExternalFiles) {
+        return of(
+          PublicationActions.publishFail(
+            errorsMessages.publicationWithExternalFilesFailed,
+          ),
+        );
+      }
+
       return PublicationService.createPublicationRequest(payload).pipe(
         switchMap(() => EMPTY),
         catchError((err) => {
@@ -100,13 +120,9 @@ const publishFailEpic: AppEpic = (action$) =>
   action$.pipe(
     filter(PublicationActions.publishFail.match),
     map(({ payload }) => {
-      let msg = payload ?? errorsMessages.publicationFailed;
-
-      if (payload?.toLowerCase()?.trim()?.startsWith('not private url')) {
-        msg = errorsMessages.publicationWithExternalFilesFailed;
-      }
-
-      return UIActions.showErrorToast(translate(msg));
+      return UIActions.showErrorToast(
+        translate(payload ?? errorsMessages.publicationFailed),
+      );
     }),
   );
 
diff --git a/apps/chat/src/store/share/share.epics.ts b/apps/chat/src/store/share/share.epics.ts
index 0a5a10bae5..3795c283b8 100644
--- a/apps/chat/src/store/share/share.epics.ts
+++ b/apps/chat/src/store/share/share.epics.ts
@@ -17,7 +17,11 @@ import { combineEpics } from 'redux-observable';
 
 import { ConversationService } from '@/src/utils/app/data/conversation-service';
 import { ShareService } from '@/src/utils/app/data/share-service';
-import { constructPath, isAttachmentLink } from '@/src/utils/app/file';
+import {
+  constructPath,
+  isAttachmentLink,
+  isConversationHasExternalAttachments,
+} from '@/src/utils/app/file';
 import { splitEntityId } from '@/src/utils/app/folders';
 import { isConversationId, isFolderId, isPromptId } from '@/src/utils/app/id';
 import { EnumMapper } from '@/src/utils/app/mappers';
@@ -115,6 +119,14 @@ const shareConversationEpic: AppEpic = (action$) =>
             res?.playback?.messagesStack || res?.messages,
           );
 
+          if (res && isConversationHasExternalAttachments(res)) {
+            return of(
+              ShareActions.shareFail(
+                errorsMessages.shareWithExternalFilesFailed,
+              ),
+            );
+          }
+
           return ShareService.share({
             invitationType: ShareRequestType.link,
             resources: [
@@ -133,7 +145,7 @@ const shareConversationEpic: AppEpic = (action$) =>
             }),
             catchError((err) => {
               console.error(err);
-              return of(ShareActions.shareFail(err.message));
+              return of(ShareActions.shareFail());
             }),
           );
         }),
@@ -172,6 +184,14 @@ const shareConversationFolderEpic: AppEpic = (action$) =>
             )
             .map((url) => ({ url }));
 
+          if (conversations.some(isConversationHasExternalAttachments)) {
+            return of(
+              ShareActions.shareFail(
+                errorsMessages.shareWithExternalFilesFailed,
+              ),
+            );
+          }
+
           return ShareService.share({
             invitationType: ShareRequestType.link,
             resources: [
@@ -188,7 +208,7 @@ const shareConversationFolderEpic: AppEpic = (action$) =>
             }),
             catchError((err) => {
               console.error(err);
-              return of(ShareActions.shareFail(err.message));
+              return of(ShareActions.shareFail());
             }),
           );
         }),
@@ -253,14 +273,9 @@ const shareFailEpic: AppEpic = (action$) =>
   action$.pipe(
     filter(ShareActions.shareFail.match),
     map(({ payload }) => {
-      const msg = payload
-        ?.toLowerCase()
-        ?.trim()
-        ?.startsWith('incorrect resource link provided')
-        ? errorsMessages.shareWithExternalFilesFailed
-        : errorsMessages.shareFailed;
-
-      return UIActions.showErrorToast(translate(msg));
+      return UIActions.showErrorToast(
+        translate(payload ?? errorsMessages.shareFailed),
+      );
     }),
   );
 
diff --git a/apps/chat/src/utils/app/file.ts b/apps/chat/src/utils/app/file.ts
index d9b4b91eec..3405074ca1 100644
--- a/apps/chat/src/utils/app/file.ts
+++ b/apps/chat/src/utils/app/file.ts
@@ -1,5 +1,7 @@
 import { TFunction } from 'next-i18next';
 
+import { BucketService } from '@/src/utils/app/data/bucket-service';
+
 import { Attachment, Conversation } from '@/src/types/chat';
 import { UploadStatus } from '@/src/types/common';
 import { DialFile, DialLink, FileFolderAttachment } from '@/src/types/files';
@@ -9,7 +11,7 @@ import { FOLDER_ATTACHMENT_CONTENT_TYPE } from '@/src/constants/folders';
 
 import { ApiUtils } from '../server/api';
 import { doesHaveDotsInTheEnd } from './common';
-import { getPathToFolderById } from './folders';
+import { getPathToFolderById, splitEntityId } from './folders';
 import { isFolderId } from './id';
 
 import escapeRegExp from 'lodash-es/escapeRegExp';
@@ -434,3 +436,30 @@ export const isAbsoluteUrl = (url: string): boolean => {
 
 export const getDownloadPath = (file: DialFile) =>
   file.absolutePath ? constructPath(file.absolutePath, file.name) : file.id;
+
+export const isConversationHasExternalAttachments = (
+  conversation: Conversation,
+): boolean => {
+  const userBucket = BucketService.getBucket();
+  const messages =
+    conversation.playback?.messagesStack ?? conversation.isReplay
+      ? [
+          ...(conversation.replay?.replayUserMessagesStack ?? []),
+          ...conversation.messages,
+        ]
+      : conversation.messages;
+
+  const attachments = messages
+    .flatMap((message) => message.custom_content?.attachments ?? [])
+    .filter(
+      (attachment) => attachment.url && !isAttachmentLink(attachment.url),
+    );
+
+  return attachments.some((attachment) => {
+    const { bucket: attachmentBucket } = splitEntityId(
+      attachment.url as string,
+    );
+
+    return attachmentBucket !== userBucket;
+  });
+};