|The method Upload sends the file SrcFile to the FTP server and stores it there under the name DstFile. If Append is TRUE the uploaded file is appended to DstFile.
The function returns the following error codes:
0 ... everything is OK
-1 ... not connected
-2 ... SrcFile does not exist
-4 ... cannot write file (access error)
-5 ... the FTP server does not recognize one or more particular FTP commands (try to use passive mode)
-9 ... unspecified error