Limition Upload File Submission. File is too big

How to resolved this error. in the section where we can setup the maximum upload file submission? thank you

Have you checked your settings in the php.ini file?
Typically, to change the limit, values ​​are set in the upload_max_filesize and post_max_size parameters. But by default, if I’m not mistaken, the limit is set to 8MiB

where can I find the php.ini file?

Are you using apache server?
In this case, the file may be located at the path etc/php/“apache version”/apache2