diff --git a/DearFTP/Connection/Commands/StoreCommand.cs b/DearFTP/Connection/Commands/StoreCommand.cs
index 772be37..e7a7a9f 100644
--- a/DearFTP/Connection/Commands/StoreCommand.cs
+++ b/DearFTP/Connection/Commands/StoreCommand.cs
@@ -13,7 +13,9 @@ namespace DearFTP.Connection.Commands
 
         public string[] Aliases { get; } = new string[]
         {
-            "STOR"
+            "APPE",
+            "STOR",
+            "STOU"
         };
 
         public void Execute(Session session, FtpStream stream, string alias, string argument)
@@ -26,7 +28,9 @@ namespace DearFTP.Connection.Commands
                 return;
             }
 
-            var (navigablePath, realPath) = session.NavigablePath.GetNewSystemFilePath(argument);
+            string path = alias.ToUpper() == "STOU" ? Path.GetRandomFileName() : argument;
+
+            var (navigablePath, realPath) = session.NavigablePath.GetNewSystemFilePath(path);
 
             if (realPath == null)
             {
@@ -48,16 +52,16 @@ namespace DearFTP.Connection.Commands
 
             stream.Send(ResponseCode.FileStatusOK, "Waiting file.");
 
-            ReceiveFile(dataConnection.Stream, realPath);
+            ReceiveFile(dataConnection.Stream, realPath, alias.ToUpper() == "APPE");
 
             dataConnection.Close();
 
             stream.Send(ResponseCode.CloseDataConnection, "File received.");
         }
 
-        private void ReceiveFile(NetworkStream stream, string path)
+        private void ReceiveFile(NetworkStream stream, string path, bool append)
         {
-            using (var file = File.Open(path, FileMode.Create))
+            using (var file = File.Open(path, append ? FileMode.Append : FileMode.Create))
             {
                 Span<byte> buffer = stackalloc byte[BufferSize];
                 int readBytes;