Increasing the max upload size is done in the following manner:

• use FTP to go to your website
• create a new php.ini file in the root of your website
• add the following code to your php.ini file

upload_max_filesize = 256M
post_max_size = 256M

• When done, save, and check if your upload is higher now (System/System information, tab PHP information, search for upload_max_filesize)
  
  
  
  
  
  
• Also, go to Joomla admin panel - media / options and upload your filesize there: