WordPress comes with its own media uploader. It makes uploading files to a blog an easy task – there is no need to deal with FTP clients or File Managers. All media files you want to have on your blog can be easily uploaded by clicking just a few buttons.
However, it’s worth to mention, that media uploader uses PHP to upload files to the server and, unfortunately, there is an upload limit for maximum file size. You can quickly check your WordPress upload file limit in WordPress Admin Dashboard -> Media -> Add New section.
Follow these steps :
Access cPanel and look for Select PHP version in Software section.
Click on Change to PHP options.
Modify the post_max_size and upload_max_filesize values.
Click on Save button to save the changes.