Your converted file is 800MB:
MCEBuddy.Engine.ConversionJob → Finished writing metadata, file size [KB] 816,418.00
It’s windows that’s falling to copy the converted file to your network destination, it appears to duplicate the file and then fails. MCEBuddy check for a duplicate right before it copies it but windows says no and then it fails with this error
MCEBuddy.Engine.ConversionJob → Moving converted file C:\Users\riopa\Videos\temp\working1\Supernatural S15E04 20191107 [20191108-0100].mpg to \DS214PLAY\Uploads\Lumia 925 Converted Files\EDL\Supernatural S15E04 20191107 [20191108-0100].mpg
ERROR> → Unable to move file C:\Users\riopa\Videos\temp\working1\Supernatural S15E04 20191107 [20191108-0100].mpg to \DS214PLAY\Uploads\Lumia 925 Converted Files\EDL
Error :System.IO.IOException: The file exists.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalMove(String sourceFileName, String destFileName, Boolean checkHost)
at MCEBuddy.Util.FileIO.MoveAndInheritPermissions(String source, String destination, Boolean overwriteDestination)
at MCEBuddy.Engine.ConversionJob.MoveConvertedFile(String subDestinationPath, Log jobLog)
ERROR> 2019-11-10T09:37:21 MCEBuddy.Engine.ConversionJob → Moving converted file to destination failed