I tried a few times with my phone but couldn’t do it still. But it definitely works better to upload by computer. I just had to message the video to myself, if it won’t fit in email you can use Facebook messenger to send to yourself and then download on the computer. Of course you can take part anytime, no video is too old, as long as you do seven days. Hopefully you can get Dtube to work for you soon, looking forward to seeing your content, good luck!