The uploaded file exceeds the upload_max_filesize directive in php.ini. *when uploading a plugin (in wordpress)

Question

(I'm a beginner/intermediate in programming/coding #learning)

I'm using Nginx on Ubuntu 20.04, and I am getting The uploaded file exceeds the upload_max_filesize directive in php.ini. whenever I'm uploading a plugin that is more than 2 MB in size.

I Tried editing the code in wp-config.php by adding -

@ini_set( 'upload_max_filesize', '1024M' );
@ini_set( 'post_max_size', '1024M' );
@ini_set( 'memory_limit', '128M' );
@ini_set( 'max_execution_time', '300' );
@ini_set( 'max_input_time', '300' );

/* That's all, stop editing! Happy publishing. */

and I even changed the code/configuration in my php.ini which is in my /etc/php/7.4 folder/file as well by editing the code in that file as well, by adding the exact same code in the exact same field as mentioned in the above code.

and I have 2 php.ini files one in fpm and one in cli

/etc/php/7.4$ ls
cli  fpm

I changed both the files' php.ini by -

upload_max_filesize = 1024M
post_max_size = 1024M
memory_limit = 128M
max_execution_time = 300
max_input_time = 300

but still, the same problem The uploaded file exceeds the upload_max_filesize directive in php.ini.

and FYI I don't have the .htaccess file, so please don't suggest/tell me to edit the .htaccess file

PS: my website is hosted on the Google Cloud Platform and I have ssh and root access to it.

Please help me resolve this issue...