Merge pull request #1466 from rsanjuan87/master

add store in folder by millis

Author: Miguel Ruivo

android/src/main/java/com/mr/flutter/plugin/filepicker/FileUtils.java

@@ -296,7 +296,7 @@ public static FileInfo openFileStream(final Context context, final Uri uri, bool
         FileOutputStream fos = null;
         final FileInfo.Builder fileInfo = new FileInfo.Builder();
         final String fileName = FileUtils.getFileName(uri, context);
-        final String path = context.getCacheDir().getAbsolutePath() + "/file_picker/" + (fileName != null ? fileName : System.currentTimeMillis());
+        final String path = context.getCacheDir().getAbsolutePath() + "/file_picker/"+System.currentTimeMillis() +"/"+ (fileName != null ? fileName : "unamed");
 
         final File file = new File(path);