Updating Failed

A few days ago I am having a problem with WP. When I try to update a post or create a new one, I still get the error “Udating failed”. I have already seen several tips on disabling plug-ins, installing Health Check and installing Classic Editor. The only thing that worked was to install Classic Editor but I don’t like how that plugging works. In this video they also solve it but I don’t know if it is correct to do so. I think there must be a way to fix this without having to depend on the installation of a third-party plug-in.