When you say you have created a file in my documents and want to upload this file to the primetest 300 do you mean "upload" in the sense that you want to transfer data from PC to PrimeTest?
We (Seaward) use the term "upload" to refer to the process of transfering asset details from PC to tester for the purposes of retesting. Is this what you are trying to do? Upload in our sense can only be carried out using PATGuard software. You can transfer data from PC to PrimeTest using the Bluetooth downloader supplied with the product for the purposes of configuring the tester, for example loading a list of sites, users, locations or asset descriptions to avoid having to type them in on the tester.
I hope I have answered your question - if not please let me know.