Uploading video to dtube

I just opened a dtube account and wanted to upload a few tutorial videos to help others in the little way I can. Unfortunately, after upload using the upload icon on the site, dtube responds saying that the video is not an image file (which I am aware of) and fails! The first file I tried uploading was over 80MB so I thought the error was due to file size. But, I reproduced the video and compressed it to a little above 20MB yet, the video won't upload. It keeps failing and returning the same error (that the file is not an image file).

Is dtube only for images (still pictures) or is there something I am not getting right?