The maximum size permitted by your PHP configuration

In these tutorials, No data was received to import. Either no file name was submitted, or the file size exceeded the maximum size permitted by your PHP configuration.

Now go to the PHP folder and search for a php.ini file. and Find upload_max_filesize text.

#Old code
upload_max_filesize = 2M

#New code
upload_max_filesize = 256M

Restart the apache

Command line interface.

$ systemctl restart apache2