Hi, and thanks for your support and your message!
It sounds like your phone might be having trouble handling the 4K resolution. I’ve just uploaded a 720p version of the video, which should work much more smoothly on your device.
As for your tablet, if you're only getting sound, it could be due to a missing or unsupported video codec. I’d recommend checking if your system and video player are up to date. You might also want to try a different video player app, like VLC, which supports a wide range of formats.
Let me know if the new version works better for you!