Is it possible to
1) download WTC file and save to user's storage.
2) load this wtc file from storage instead of specific path in streaming asset folder or WebURL.
Kittiphat I completely agrees with you answer as WTC file can be used by creating the target and that need to be stored in AWS cloud sever.
1.) WTC files can be downloaded. You can use them to create targets, but those targets will have their assets stored in our cloud (usually our AWS S3 storage).
2) Therefore, this is most likely not possible. But could you please clarify if you are talking about this feature in a mobile app context?