Again, is the filename.kepub or filename.kepub.epub? The extension must be the double barrelled .kepub.epub to use the Kobo renderer or .epub to use the RMSDK renderer. A simple .kepub will not be recognized.
In the configuration for the KoboTouch driver in calibre 8.x, on the second tab, try removing the checkmark from the Use Kobo viewer for EPUB books to disable sending kepub.epub and see if the books show. Also what is the Save template on the first tab of the configuration dialog?
Did you try copying the tester folder in the .zip file I attached to a previous message to the root of your Kobo's internal storage? Not through calibre but simply a file copy.
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