diff --git a/native/input/input-state-container.react.js b/native/input/input-state-container.react.js
--- a/native/input/input-state-container.react.js
+++ b/native/input/input-state-container.react.js
@@ -643,7 +643,10 @@
   }
 
   shouldEncryptMedia(threadInfo: ThreadInfo): boolean {
-    return threadInfoInsideCommunity(threadInfo, commStaffCommunity.id);
+    return (
+      threadTypeIsThick(threadInfo.type) ||
+      threadInfoInsideCommunity(threadInfo, commStaffCommunity.id)
+    );
   }
 
   sendMultimediaMessage = async (
@@ -871,12 +874,16 @@
       uploadResult,
       uploadThumbnailResult,
       mediaMissionResult;
+
+    const isThickThread = threadTypeIsThick(threadInfo.type);
+    const useBlobService = isThickThread || this.useBlobServiceUploads;
     try {
       if (
-        this.useBlobServiceUploads &&
+        useBlobService &&
         (processedMedia.mediaType === 'encrypted_photo' ||
           processedMedia.mediaType === 'encrypted_video')
       ) {
+        const uploadMetadataToKeyserver = !isThickThread;
         const uploadPromise = this.props.blobServiceUpload({
           uploadInput: {
             blobInput: {
@@ -893,7 +900,7 @@
                 ? processedMedia.thumbHash
                 : null,
           },
-          keyserverOrThreadID: threadInfo.id,
+          keyserverOrThreadID: uploadMetadataToKeyserver ? threadInfo.id : null,
           callbacks: {
             blobServiceUploadHandler,
             onProgress: (percent: number) => {
@@ -926,7 +933,9 @@
                 dimensions: processedMedia.dimensions,
                 thumbHash: processedMedia.thumbHash,
               },
-              keyserverOrThreadID: threadInfo.id,
+              keyserverOrThreadID: uploadMetadataToKeyserver
+                ? threadInfo.id
+                : null,
               callbacks: {
                 blobServiceUploadHandler,
               },
diff --git a/web/input/input-state-container.react.js b/web/input/input-state-container.react.js
--- a/web/input/input-state-container.react.js
+++ b/web/input/input-state-container.react.js
@@ -441,7 +441,10 @@
   }
 
   shouldEncryptMedia(threadInfo: ThreadInfo): boolean {
-    return threadInfoInsideCommunity(threadInfo, commStaffCommunity.id);
+    return (
+      threadTypeIsThick(threadInfo.type) ||
+      threadInfoInsideCommunity(threadInfo, commStaffCommunity.id)
+    );
   }
 
   async sendMultimediaMessage(
@@ -757,7 +760,7 @@
           },
         };
       },
-      () => this.uploadFiles(threadInfo.id, newUploads),
+      () => this.uploadFiles(threadInfo, newUploads),
     );
     return true;
   }
@@ -867,16 +870,17 @@
   }
 
   uploadFiles(
-    threadID: string,
+    threadInfo: ThreadInfo,
     uploads: $ReadOnlyArray<PendingMultimediaUpload>,
   ): Promise<mixed> {
     return Promise.all(
-      uploads.map(upload => this.uploadFile(threadID, upload)),
+      uploads.map(upload => this.uploadFile(threadInfo, upload)),
     );
   }
 
-  async uploadFile(threadID: string, upload: PendingMultimediaUpload) {
+  async uploadFile(threadInfo: ThreadInfo, upload: PendingMultimediaUpload) {
     const { selectTime, localID, encryptionKey } = upload;
+    const threadID = threadInfo.id;
     const isEncrypted =
       !!encryptionKey &&
       (upload.mediaType === 'encrypted_photo' ||
@@ -918,8 +922,10 @@
         abortHandler: (abort: () => void) =>
           this.handleAbortCallback(threadID, localID, abort),
       };
+      const isThickThread = threadTypeIsThick(threadInfo.type);
+      const useBlobService = isThickThread || this.useBlobServiceUploads;
       if (
-        this.useBlobServiceUploads &&
+        useBlobService &&
         (upload.mediaType === 'encrypted_photo' ||
           upload.mediaType === 'encrypted_video')
       ) {
@@ -941,7 +947,7 @@
             loop: false,
             thumbHash,
           },
-          keyserverOrThreadID: threadID,
+          keyserverOrThreadID: isThickThread ? null : threadID,
           callbacks,
         });
       } else {
@@ -1645,7 +1651,7 @@
       };
     });
 
-    void this.uploadFiles(threadInfo.id, uploadsToRetry);
+    void this.uploadFiles(threadInfo, uploadsToRetry);
   }
 
   addReply = (message: string) => {