Films uploaded to YouTube at 1080p or below play at 360p in any embedded player, including ours. That is a YouTube restriction, not a KTL one, and it hits every site on the internet that embeds YouTube. Nothing on either end overrides it.
Export above 1080p. 1440p is enough, you do not need 4K.
You don’t need to shoot in 4k to export in 4k. But that’ll give youtube enough information to embed 1080+ on the site.
Got a film already up that looks soft? Re-export above 1080p, re-upload, and post here. We will swap the link over.