Hello and welcome to the forum,
Can you explain how and what you did upload? Is it working OK with Preview in Browser? If yes, be sure to upload all files created when publishing. If you published to SWF, normally you'll have at least a JS and a HTML-file. The last has to be launched. If you have reporting enabled you should have published as a SCO which results in a zipped folder with a lot of files in it, all required to enable reporting. I don't use Plateau but another LMS and I find the easiest way to upload another presentation is to have it zipped (there is a butotn in the publishing dialog box), and upload the package instructing the LMS to unzip and launch the HTML-file. But I'm not sure that this is possible with Plateau.
Lilybiri