diff --git a/tools/chatgui-android/jni_bridge/android_jni_bridge.c b/tools/chatgui-android/jni_bridge/android_jni_bridge.c
index f3349b97..fb0d3eed 100644
--- a/tools/chatgui-android/jni_bridge/android_jni_bridge.c
+++ b/tools/chatgui-android/jni_bridge/android_jni_bridge.c
@@ -659,13 +659,13 @@ void utun_bridge_dm_request_messages(const char* conv_id) {
     uasync_post(ua, dm_messages_trampoline, req);
 }
 
-void utun_bridge_dm_send_file(const char* conv_id, const char* path, const char* name) {
+int utun_bridge_dm_send_file(const char* conv_id, const char* path, const char* name) {
     struct UASYNC* ua = instance_lite_get_uasync();
-    if (!conv_id || !path || !name || !uasync_is_running(ua)) { bridge_log(BLEV_WARN, "DM file: invalid request/core stopped"); return; }
+    if (!conv_id || !path || !name || !uasync_is_running(ua)) { bridge_log(BLEV_WARN, "DM file: invalid request/core stopped"); return -1; }
     struct dm_file_req* req = u_calloc(1, sizeof(*req));
-    if (!req) { bridge_log(BLEV_ERROR, "DM file: OOM"); return; }
+    if (!req) { bridge_log(BLEV_ERROR, "DM file: OOM"); return -1; }
     if (strlen(conv_id) >= sizeof(req->conv) || strlen(path) >= sizeof(req->path) || strlen(name) >= sizeof(req->info.name)) {
-        bridge_log(BLEV_ERROR, "DM file: path, conversation or name too long"); u_free(req); return;
+        bridge_log(BLEV_ERROR, "DM file: path, conversation or name too long"); u_free(req); return -1;
     }
     req->inst = instance_lite_get_instance();
     snprintf(req->conv, sizeof(req->conv), "%s", conv_id);
@@ -673,7 +673,12 @@ void utun_bridge_dm_send_file(const char* conv_id, const char* path, const char*
     req->info.kind = ATTACHMENT_FILE;
     req->remove_source = 1; /* PM picker передаёт собственный уникальный cache-файл. */
     snprintf(req->info.name, sizeof(req->info.name), "%s", name);
-    uasync_post(ua, dm_send_file_trampoline, req);
+    if (attachment_validate(&req->info)) { bridge_log(BLEV_ERROR, "DM file: invalid name"); u_free(req); return -1; }
+    struct posted_task* post = u_calloc(1, sizeof(*post));
+    if (!post) { bridge_log(BLEV_ERROR, "DM file: completion allocation failed"); u_free(req); return -1; }
+    post->callback = dm_send_file_trampoline; post->arg = req;
+    uasync_post_reserved(ua, post);
+    return 0;
 }
 
 void utun_bridge_set_debug_level(const char* category, const char* level) {
@@ -1914,16 +1919,17 @@ JNIEXPORT void JNICALL Java_com_utun_chat_data_NativeLib_nativeDmRequestMessages
     if (c) (*env)->ReleaseStringUTFChars(env, convId, c);
 }
 
-JNIEXPORT void JNICALL Java_com_utun_chat_data_NativeLib_nativeDmSendFile(
+JNIEXPORT jboolean JNICALL Java_com_utun_chat_data_NativeLib_nativeDmSendFile(
     JNIEnv* env, jobject thiz, jstring convId, jstring path, jstring name) {
     (void)thiz;
     const char* c = (*env)->GetStringUTFChars(env, convId, NULL);
     const char* p = (*env)->GetStringUTFChars(env, path, NULL);
     const char* n = (*env)->GetStringUTFChars(env, name, NULL);
-    utun_bridge_dm_send_file(c, p, n);
+    int rc = utun_bridge_dm_send_file(c, p, n);
     if (n) (*env)->ReleaseStringUTFChars(env, name, n);
     if (p) (*env)->ReleaseStringUTFChars(env, path, p);
     if (c) (*env)->ReleaseStringUTFChars(env, convId, c);
+    return rc == 0 ? JNI_TRUE : JNI_FALSE;
 }
 
 JNIEXPORT jlong JNICALL Java_com_utun_chat_data_NativeLib_nativeGetMyNodeId(
diff --git a/tools/chatgui-android/jni_bridge/android_jni_bridge.h b/tools/chatgui-android/jni_bridge/android_jni_bridge.h
index c47c06db..18c8fca2 100644
--- a/tools/chatgui-android/jni_bridge/android_jni_bridge.h
+++ b/tools/chatgui-android/jni_bridge/android_jni_bridge.h
@@ -210,7 +210,7 @@ void  utun_bridge_dm_start(uint64_t node_id, const char* source_ch_id, const cha
 void  utun_bridge_dm_send(const char* conv_id, const char* text);
 void utun_bridge_dm_request_conversations(void);
 void utun_bridge_dm_request_messages(const char* conv_id);
-void utun_bridge_dm_send_file(const char* conv_id, const char* path, const char* name);
+int utun_bridge_dm_send_file(const char* conv_id, const char* path, const char* name);
 
 #ifdef __cplusplus
 }