The uploadthing is a Service that is responsible for uploading data to the ThingWorx Analytics Server through the Analytics Builder Mashup.
Here is a link to Documentation that goes over how to install and configure the upload thing.
Let me know if you have any further questions about this.
I have gone through the documentation of how to install and configure the upload thing,
I need a document for how can we use in in actual to transfer data from builder to analytic server ,probably with the help of a example ,anything a document a video,or just steps how can we use it.
The UploadThing is a background service used by ThingWorx Analytics Builder when creating a new dataset.
When a new dataset is created and one select the json and csv file related to it, the upload function uses UploadThing in the background. This is the way you will use UploadThing. You can check those steps in this video: ThingWorx Analytics Builder - Upload Data
Hope this helps