How to enable log files and upload debugging

ENABLE LOGGING

Open Rightload and click Help -> Open Temp Directory.... This is the directory the log files will appear in.
In Rightload, click Tools -> Options... to open the options screen. Select the tab labeled Advanced at the top.
In the box Logging, there should be an option Create log file. Enable this option by ticking the box next to it.
Click OK to save the settings.
From now on, everything that happens in Rightload will be saved to the file _log.txt in the directory you opened in the first step.

ENABLE UPLOAD DEBUGGING

To enable upload debugging for the next upload, click Help -> Enable Upload Debugging and select OK in the warning window.
Then, start your upload, answering the second warning with OK as well.
After the upload is done, close Rightload.
There should now be a file called Rightload_FTP.txt in the temp directory. (see above)
For security reasons, you should remove your FTP password (usually in line three) from the file before sending it.