Dunno if you are still working on this one, but with the arrival of SDK 4.9.68, I've been working on getting all of my watch faces building, running, and most challenging: settings. I haven't gotten anything working with the preview component, but I'm not sure if it is the preview component, per-se, because I've had trouble with other settings pages as well. As we all know, it's very challenging to debug. Sometimes I think it is package compatibility; the ways that package interact seems different than the old tooling. But I can't really pin down a single culprit. For example, sometimes it comes down to removal of underscore as a dependency that get's a settings page to work, but then there is one case where it works with underscore, so that theory feels pretty weak. Other times I wonder if it isn't just the overall size of the javascript bundle. Maybe there are tighter URL length limitations than before? And sometimes it might just be outdated javascript that crashes silently with no log output. In any case, it doesn't look like I'll be able to help get the preview component working for anybody any time soon, which is a bummer. For my own faces, I'm just going to strip down the settings. No previews, no custom color selections. Just going to be what it is. I'm too old and crabby to spend my days fighting with javascript anymore, ha!