The link : "https://devcenter.appery.io/tutorials..." has issues in saving files.
I followed the tutorial as per instructions.
The tutorial snapshot shown by Appery says that it saved a file 'UploadingFile.JPG' with size 25.23 KB
But my file is always saved with 25 bytes( yes 25 bytes, thus never visible).
It uses 'uploadMultipleFilesHelper' function as instructed.
Here is appery snapshot and my snapshot showing files size issue.