Step 1: Log in into your Plesk control panel.
Step 2: Navigate to “Tools & Settings” from the left-hand menu.
Step 3: Under “General Settings,” click on “PHP Settings” or “Web Server Settings,” depending on your Plesk version.
Step 4: Choose the PHP version that your website uses (e.g., PHP 7.4).
Step 5: Locate and click on the “upload_max_filesize” and “post_max_size” options.
Step 6: Adjust the values for “upload_max_filesize” and “post_max_size” to your desired maximum upload file size, using megabytes (MB) or shorthand notations (e.g., “2M” for 2 megabytes, “512K” for 512 kilobytes).
Step 7: Save your changes by clicking “OK” or “Apply.”
Step 8: To ensure changes take effect, restart your web server.
On Linux servers with Apache, use:
service apache2 restart
On Windows servers with IIS, use:
iisreset