diff --git a/Store/ZeroTier.py b/Store/ZeroTier.py
index 6fa6221..b82dac1 100644
--- a/Store/ZeroTier.py
+++ b/Store/ZeroTier.py
@@ -288,7 +288,7 @@ class ZeroTier(Store):
             url += f"{sep}api_key={self._api_key}"
         return url
 
-    def download_to_temp(self, file_hash: str, temp_root: Optional[Path] = None) -> Optional[Path]:
+    def download_to_temp(self, file_hash: str, temp_root: Optional[Path] = None, suffix: Optional[str] = None) -> Optional[Path]:
         """Download a file from the remote peer to a local temporary file."""
         import os
         import httpx
@@ -301,13 +301,19 @@ class ZeroTier(Store):
         if not url or not isinstance(url, str) or not url.startswith("http"):
             return None
 
+        # Ensure suffix starts with a dot if provided
+        if suffix and not suffix.startswith("."):
+            suffix = f".{suffix}"
+        if not suffix:
+            suffix = ".tmp"
+
         try:
             # Use provided temp_root or system temp
             if temp_root:
                 temp_root.mkdir(parents=True, exist_ok=True)
-                fd, tmp_path = tempfile.mkstemp(dir=str(temp_root), suffix=".tmp")
+                fd, tmp_path = tempfile.mkstemp(dir=str(temp_root), suffix=suffix)
             else:
-                fd, tmp_path = tempfile.mkstemp(suffix=".tmp")
+                fd, tmp_path = tempfile.mkstemp(suffix=suffix)
             
             os_fd = os.fdopen(fd, 'wb')
             
diff --git a/cmdlet/add_file.py b/cmdlet/add_file.py
index 6d764b7..7353e14 100644
--- a/cmdlet/add_file.py
+++ b/cmdlet/add_file.py
@@ -972,8 +972,30 @@ class Add_File(Cmdlet):
 
         tmp_dir: Optional[Path] = None
         try:
+            # Extract suffix from pipe_obj path to avoid .tmp rejections
+            suffix = None
+            if pipe_obj.path:
+                try:
+                    suffix = Path(pipe_obj.path).suffix
+                except Exception:
+                    pass
+            
+            # Extract suffix from metadata if available (fallback)
+            if not suffix:
+                metadata = getattr(pipe_obj, "metadata", {})
+                if isinstance(metadata, dict):
+                    suffix = metadata.get("ext")
+            
             tmp_dir = Path(tempfile.mkdtemp(prefix="add-file-src-"))
-            downloaded = downloader(str(file_hash), temp_root=tmp_dir)
+            
+            # Pass suffix to downloader if it supports it
+            import inspect
+            sig = inspect.signature(downloader)
+            if "suffix" in sig.parameters:
+                downloaded = downloader(str(file_hash), temp_root=tmp_dir, suffix=suffix)
+            else:
+                downloaded = downloader(str(file_hash), temp_root=tmp_dir)
+                
             if isinstance(downloaded, Path) and downloaded.exists():
                 pipe_obj.is_temp = True
                 return downloaded, tmp_dir