When you publish through Xara, it generates a temporary Export folder in %localappdata%\Temp (you did ask) [or, C:\Users\(login)\AppData\Local\Temp].
This remains until you close your XDA.

To be able to access this export folder, instead, first save as Export Supersite/Export Website to a folder of your choosing.
In that session, if you make changes and then Preview Website, the changes still go to the Export folder and not Temp.
Close the XDA , reopen the design file and you have to prime it to put things into the local folder all over.

Do not just try and upload one HTM file; to work, the XDA may have changed other things as I mentioned before.

If you are so worried, publish the entire website from the local export folder to a sub-folder on the server to prove it will work.

Clients are people who expect you to handle their problems and take them away. Don't hate clients, hate their problems with a passion and get the better of the problems, far more satisfying.

Spring chicken!

Acorn