Saving as webpage, uploading via FTP

[Duke]

I cannot upload my spreadsheet (saved as webpage), via ftp, through Excel. I
can successfully save the file on my computer, access the ftp server via
Internet Explorer, and then drag the file. For some reason, when I try to
use the feature in Excel, and upload the file to the same location, I get
error messages saying the file is corrupt or the location is read only.

I would like to use the Excel feature because it will automatically upload
the file every time changes are saved.

Thanks in advance
Duke