diff --git a/tools/chatgui-android/libutun_lite/attachment_sender.c b/tools/chatgui-android/libutun_lite/attachment_sender.c
index bc1f5e81..d14bc719 100644
--- a/tools/chatgui-android/libutun_lite/attachment_sender.c
+++ b/tools/chatgui-android/libutun_lite/attachment_sender.c
@@ -12,14 +12,15 @@
 #include <unistd.h>
 #include <libgen.h>
 
-int attachment_send(const char* channel_id, const char* src_file_path, const char* db_path) {
+int attachment_send(const char* channel_id, const char* src_file_path, const char* db_path,
+                    const uint8_t reply_to[32], uint64_t request_id) {
     if (!channel_id || !src_file_path || !db_path) {
         DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "attachment_send: invalid args");
         return -1;
     }
 
     struct UASYNC* ua = instance_lite_get_uasync();
-    if (!ua) { DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "attachment_send: no uasync"); return -1; }
+    if (!uasync_is_running(ua)) { DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "attachment_send: core stopped"); return -1; }
 
     /* get original basename for display, then make unique filename for storage */
     char path_copy[1024];
@@ -52,6 +53,7 @@ int attachment_send(const char* channel_id, const char* src_file_path, const cha
             tmp[off++] = media_dir[i];
             if (media_dir[i] == '/' && off > 1) { tmp[off] = '\0'; mkdir(tmp, 0755); }
         }
+        tmp[off] = '\0';
         mkdir(tmp, 0755);
     }
 
@@ -64,9 +66,14 @@ int attachment_send(const char* channel_id, const char* src_file_path, const cha
        data = original_basename — becomes first part of message "d" field: "name.ext|size|..." */
     size_t datalen = strlen(original_basename);
     struct chat_msg_submit* req = u_calloc(1, sizeof(struct chat_msg_submit) + datalen + 1);
-    if (!req) return -1;
+    struct posted_task* post = u_calloc(1, sizeof(*post));
+    if (!req || !post) {
+        DEBUG_ERROR(DEBUG_CATEGORY_MEDIA, "attachment_send: allocation failed"); u_free(req); u_free(post); return -1;
+    }
 
     req->inst = instance_lite_get_instance();
+    memcpy(req->reply_to, reply_to, sizeof(req->reply_to));
+    req->request_id = request_id;
     snprintf(req->channel_id, sizeof(req->channel_id), "%s", channel_id);
     snprintf(req->content_type, sizeof(req->content_type), "application/octet-stream");
     snprintf(req->media_src, sizeof(req->media_src), "%s", src_file_path);
@@ -80,6 +87,7 @@ int attachment_send(const char* channel_id, const char* src_file_path, const cha
     DEBUG_INFO(DEBUG_CATEGORY_GENERAL, "attachment_send: ch=%s src=%s dst=%s name=%s size=%lld",
                channel_id, src_file_path, media_file, original_basename, (long long)st.st_size);
 
-    uasync_post(ua, chat_core_submit_trampoline, req);
+    post->callback = chat_core_submit_trampoline; post->arg = req;
+    uasync_post_reserved(ua, post);
     return 0;
 }
diff --git a/tools/chatgui-android/libutun_lite/attachment_sender.h b/tools/chatgui-android/libutun_lite/attachment_sender.h
index 1447f5dc..5ad36020 100644
--- a/tools/chatgui-android/libutun_lite/attachment_sender.h
+++ b/tools/chatgui-android/libutun_lite/attachment_sender.h
@@ -3,12 +3,14 @@
  * 0 = запрос поставлен в uasync, -1 = отказ подготовки. Исходный файл нужен до завершения media-задачи. */
 #ifndef ATTACHMENT_SENDER_H
 #define ATTACHMENT_SENDER_H
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-int attachment_send(const char* channel_id, const char* src_file_path, const char* db_path);
+int attachment_send(const char* channel_id, const char* src_file_path, const char* db_path,
+                    const uint8_t reply_to[32], uint64_t request_id);
 
 #ifdef __cplusplus
 }
diff --git a/tools/chatgui-android/libutun_lite/photo_sender.c b/tools/chatgui-android/libutun_lite/photo_sender.c
index 68ee35f2..242a4acd 100644
--- a/tools/chatgui-android/libutun_lite/photo_sender.c
+++ b/tools/chatgui-android/libutun_lite/photo_sender.c
@@ -14,14 +14,14 @@
 #include <libgen.h>
 
 int photo_send(const char* channel_id, const char* src_file_path, const char* db_path,
-               int width, int height) {
+               int width, int height, const uint8_t reply_to[32], uint64_t request_id) {
     if (!channel_id || !src_file_path || !db_path) {
         DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "photo_send: invalid args");
         return -1;
     }
 
     struct UASYNC* ua = instance_lite_get_uasync();
-    if (!ua) { DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "photo_send: no uasync"); return -1; }
+    if (!uasync_is_running(ua)) { DEBUG_ERROR(DEBUG_CATEGORY_GENERAL, "photo_send: core stopped"); return -1; }
 
     struct stat st; memset(&st, 0, sizeof(st));
     if (stat(src_file_path, &st) != 0 || st.st_size <= 0) {
@@ -64,6 +64,7 @@ int photo_send(const char* channel_id, const char* src_file_path, const char* db
             tmp[off++] = media_dir[i];
             if (media_dir[i] == '/' && off > 1) { tmp[off] = '\0'; mkdir(tmp, 0755); }
         }
+        tmp[off] = '\0';
         mkdir(tmp, 0755);
     }
 
@@ -72,9 +73,14 @@ int photo_send(const char* channel_id, const char* src_file_path, const char* db
 
     size_t datalen = strlen(original_basename);
     struct chat_msg_submit* req = u_calloc(1, sizeof(struct chat_msg_submit) + datalen + 1);
-    if (!req) return -1;
+    struct posted_task* post = u_calloc(1, sizeof(*post));
+    if (!req || !post) {
+        DEBUG_ERROR(DEBUG_CATEGORY_MEDIA, "photo_send: allocation failed"); u_free(req); u_free(post); return -1;
+    }
 
     req->inst = instance_lite_get_instance();
+    memcpy(req->reply_to, reply_to, sizeof(req->reply_to));
+    req->request_id = request_id;
     snprintf(req->channel_id, sizeof(req->channel_id), "%s", channel_id);
     snprintf(req->content_type, sizeof(req->content_type), "%s", content_type);
     snprintf(req->media_src, sizeof(req->media_src), "%s", src_file_path);
@@ -92,6 +98,7 @@ int photo_send(const char* channel_id, const char* src_file_path, const char* db
                channel_id, content_type, src_file_path, media_file, original_basename,
                (long long)st.st_size, width, height);
 
-    uasync_post(ua, chat_core_submit_trampoline, req);
+    post->callback = chat_core_submit_trampoline; post->arg = req;
+    uasync_post_reserved(ua, post);
     return 0;
 }
diff --git a/tools/chatgui-android/libutun_lite/photo_sender.h b/tools/chatgui-android/libutun_lite/photo_sender.h
index 7bb84c9f..69288eb7 100644
--- a/tools/chatgui-android/libutun_lite/photo_sender.h
+++ b/tools/chatgui-android/libutun_lite/photo_sender.h
@@ -3,13 +3,14 @@
  * 0 = запрос поставлен в uasync, -1 = отказ. src_file_path должен существовать до завершения задачи. */
 #ifndef PHOTO_SENDER_H
 #define PHOTO_SENDER_H
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 int photo_send(const char* channel_id, const char* src_file_path, const char* db_path,
-               int width, int height);
+               int width, int height, const uint8_t reply_to[32], uint64_t request_id);
 
 #ifdef __cplusplus
 }