I have a Tablo Dual Light viewing from Apple TV 4K. I have never seen a Thumbnail. Recordings work fine. No tuners working. There is not a black box or anything above the playback line. These recordings are all older than 24 hours old. Some recordings are from the guide, and some are from timed recordings. I have reset the Tablo using the blue button and I have power cycled it. Never see any sign of a thumbnail. Sounds like a great feature, would really like to get this working. I feel like it’s a feature that is disabled rather than broken on mine.
I had not. I just tried from a Chrome Browser and the thumbnails work great on every recording I have tried. I have never seen them until now. Are thumbnails not supported on Apply TV (and maybe Roku based on Dave’s comment above) ?
I don’t remember ever reading about certain platforms not supporting the thumbnails, but I’ve only used Roku devices since the beginning. No problem with thumbnails here (currently using an Ultra - but have used a 2XS, 3, etc. along the way).