Here are a selection of YouTube channels focused on mental health that you might find helpful.
Osmosis – This channel contains a number of short and informative videos on different psychiatric conditions and is highly recommended.
Mental Health With Dr Elliott – He looks into how mental health is portrayed in the media (such as in the film The Joker, the Netflix series Russian Doll and others). He also has 2 minute videos on different disorders and explores the impact of drugs and alcohol on mental health.
PsychStudent – a growing resource of short films on key mental health topics