Can’t save changes or modify settings in Dashboard but Pages and Posts are fine

Figured it out. In an attempt to optimize Astra theme’s performance, I modified the PHP settings in cPanel > MultiPHP INI Editor based on recommendations online.

However, I wasn’t careful enough with my changes. I had neglected to include M in post_max_size, using only a number.

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After adding it, everything started to work correctly again.

error code: 523