Hey @Vertices welcome to the Nextcloud community 
that’s no problem, you’re on the right track 
You started your post in the support category. Unfortunately you ignored the template and a lot of information to help you is missing. Please edit your original post and add all required details like Nextcloud version, webserver type and version, os version, related log file content. Use the support template. Without additional information the community members cannot help you.
we’re certainly not going to watch that YouTube tutorial 
, so please edit your original post and add the missing information. Support template. Please use this when you request support
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