There are several ways to increase the maximum upload file size in WordPress that have been introduced. Here we just consider one way that I am applying in practice. That is, modify the php.ini configuration file.
When your users upload a file in the Dashboard (Media -> Add New), there will be a notice about the maximum upload file size like this:

Maximum upload file size is 2M by default. You can increase this value to 20M as shown in the illustration by modifying the configuration lines of /etc/php.ini as follows:

upload_max_filesize = 20M
max_file_uploads = 200
post_max_size = 80M

Finally, do not forget to restart your web server:

sudo systemctl restart httpd