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Where something like this is made in the course of employment, it is owned by the employer. So if you made it for teaching purposes at the school, then the school would own the copyright, irrespective of the log in or whose software was used and and when the editing was done. On the other hand if you made it independently but allowed the school to use it for extra curricular purposes then you would own the copyright. It all depends on whether it was made in the course of your employment or not.
Why don’t you start a new channel, upload the videos which were made in the course of your employment, give them the log in for the new channel and say that having taken legal advice from a copyright lawyer, which I am, that is what you have been advised to do so as to retain the material which is in addition to that to which the school is entitled to use. And use the word “use” rather than own so that you are not admitting that they own anything, although from what you say I think that they probably do own or share the ownership of at least some of the material.
I wouldn’t delete anything. I suspect they are more concerned about getting the material to use rather than enforcing the intellectual property rights to it.