diff --git a/src/ChunkFile.php b/src/ChunkFile.php
index 072215f..bea4515 100644
--- a/src/ChunkFile.php
+++ b/src/ChunkFile.php
@@ -94,11 +94,10 @@ public function appendFile($source, int $index = 0): ChunkFile
     /**
      * @throws FileNotFoundException
      */
-    public function createUploadedFile($chunks = null, $storageFile = null): UploadedFile
+    public function createUploadedFile($chunks = null): UploadedFile
     {
         $chunkFile = $this->chunkFile();
-
-        $storageFile = $storageFile ?: $this->storageFile();
+        $storageFile = $this->storageFile();
 
         if (is_null($chunks) === false) {
             for ($i = 0; $i < $chunks; $i++) {
diff --git a/src/FileAPI.php b/src/FileAPI.php
index ae9d6e2..da32501 100644
--- a/src/FileAPI.php
+++ b/src/FileAPI.php
@@ -51,7 +51,7 @@ protected function receiveChunked(string $name): UploadedFile
         $mimeType = $this->request->header('content-type');
         $uuid = $this->request->get('token');
 
-        $chunkFile = $this->createChunkFile($originalName, $mimeType, $uuid);
+        $chunkFile = $this->createChunkFile($originalName, $uuid, $mimeType);
         $chunkFile->appendStream($this->request->getContent(true), $start);
 
         if (! $this->isCompleted($name)) {
diff --git a/src/Filesystem.php b/src/Filesystem.php
index 95fdb7e..d663273 100644
--- a/src/Filesystem.php
+++ b/src/Filesystem.php
@@ -17,7 +17,11 @@ public function basename($path): string
 
     public function tmpfilename(string $path, string $hash = null): string
     {
-        return md5($path.$hash).'.'.strtolower($this->extension($path));
+        if (empty($hash)) {
+            $hash = md5($path);
+        }
+
+        return $hash.'.'.strtolower($this->extension($path));
     }
 
     /**
diff --git a/tests/FilesystemTest.php b/tests/FilesystemTest.php
index 25efa72..6e1a923 100644
--- a/tests/FilesystemTest.php
+++ b/tests/FilesystemTest.php
@@ -27,7 +27,7 @@ public function testTmpfilename(): void
         $path = __FILE__;
         $hash = uniqid('', true);
 
-        $this->assertSame(md5($path.$hash).'.php', $files->tmpfilename($path, $hash));
+        $this->assertSame($hash.'.php', $files->tmpfilename($path, $hash));
     }
 
     /**