Can we allow only specific YouTube channels or videos for students?
Not yet. Skie forces YouTube Restricted Mode on in Chrome, and you can switch the YouTube app on or off by group or by schedule window, but allowing only chosen channels or videos is not available. It is something the team is working on.
The honest answer first: a per-channel or per-video allow list does not exist in Skie today. If a school needs 'only these ten channels', the product cannot enforce that yet.
What does exist covers part of the need. Restricted Mode is forced on in Chrome, so YouTube in the browser hides videos flagged as mature. The YouTube app can be left off a group's list. Schedules decide when the browser or the app is available, and a lesson window can give a class an extra app for one period.
Many schools find a layered approach works well enough. Keep YouTube off during lessons by default. Open a short window when a teacher is using a video, with the class's browser on and Restricted Mode enforced. Close the window after. The filtering DNS keeps other categories out throughout.
For tighter cases, such as an exam hall or a primary classroom, the simplest control is leaving the browser and the YouTube app off altogether and giving students only the learning apps. A kiosk or a one-app list locks a device to exactly one app.
If this is a deciding factor for you, say so in a pilot review. It helps the team understand the need. There is no date to give, and Skie will not describe the feature as available before it is.