diff --git a/src/core/engines/noweb/session.noweb.core.ts b/src/core/engines/noweb/session.noweb.core.ts
index 631e0dfc..7182a6ea 100644
--- a/src/core/engines/noweb/session.noweb.core.ts
+++ b/src/core/engines/noweb/session.noweb.core.ts
@@ -1205,12 +1205,20 @@ export class WhatsappSessionNoWebCore extends WhatsappSession {
         urlInfo.jpegThumbnail = thumbnail.buffer;
       } else {
         // upload HQ thumbnail
+        // newsletters need the thumbnail uploaded unencrypted (plaintext path),
+        // otherwise clients can not render it (white/blurred preview image)
+        const uploadToServer = this.sock.waUploadToServer;
+        const uploadThumbnail = async (encFilePath, opts) => {
+          opts.newsletter = isJidNewsletter(chatId);
+          return await uploadToServer(encFilePath, opts);
+        };
         const { imageMessage } = await esm.b.prepareWAMessageMedia(
           { image: content },
           {
-            upload: this.sock.waUploadToServer,
+            upload: uploadThumbnail,
             mediaTypeOverride: 'thumbnail-link',
             options: { signal: AbortSignal.timeout(10_000) },
+            jid: chatId,
           },
         );
         urlInfo.jpegThumbnail = imageMessage?.jpegThumbnail
diff --git a/yarn.lock b/yarn.lock
index 848088f6..15cf7213 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7,7 +7,7 @@ __metadata:
 
 "@adiwajshing/baileys@github:devlikeapro/Baileys#fork-master-2026-04-28":
   version: 7.0.0-rc13
-  resolution: "@adiwajshing/baileys@https://github.com/devlikeapro/Baileys.git#commit=942ba050bab32436384e267ec2d8122ca434fba6"
+  resolution: "@adiwajshing/baileys@https://github.com/devlikeapro/Baileys.git#commit=c4d8d4ed69edfd443132465d6c72bfaa70b6b0d6"
   dependencies:
     "@cacheable/node-cache": "npm:^1.4.0"
     "@hapi/boom": "npm:^9.1.3"
@@ -32,7 +32,7 @@ __metadata:
       optional: true
     link-preview-js:
       optional: true
-  checksum: 10/44194fa66bd9b6f3ca1cac9aa2e0edc88a5c2537b6bf366c70f9ebcb4560888785af8c5f4f2f18851d5fd9f55f7421a319a0157c0c6ed8d72734e3c9a0946c0c
+  checksum: 10/4beee88b635785f2879bfac4d038a9d6cc531f1a309503e88cb142047b3345265bf1024df51b08dfa56f4ece5f53177e3033f6661281f528130dd0964a978821
   languageName: node
   linkType: hard