Yes, you can use any text file as input as well. See a screenshot attached of a text file with Notepad, and using this file for a File Variable in Neoload.
Based on Response you have received it looks like the File you want to upload is not present in the directory of Source File or Path is not right
Also check your File...
Neoload allows to export all the details but doesn't give option to export exact request/response when error occurs. Even in debug mode it displays but doesn't allow to export...
This is not possible to log these information during runtime, but you can export the data at the end of the test. What is your use case, why do you need to log the information?
