If you are having problems uploading PPT or PPTX files into Adobe Connect, check that the file name extension is correct.
If you have a PPTX file that is named with .PPT extension, then it generate an error when uploading to Adobe Connect. The opposite is also true: uploading PPT files that have .pptx extension will cause an error when uploading.
To check if a PowerPoint file should be named with PPTX or PPT extension, a quick way to verify is to rename the file to have .ZIP extension, and if you can open the file as a ZIP archive and view the internal contents, then it is a PPTX file. If you cannot view internal contents, then it is a PPT file.