v1.7.0 and above default upload limit is 200MB, regardless of upload limit of your Global PHP. To increase this limit go to:
https://<IP Addres>:8090/websites/domain.com
Then scroll down and click vhost Conf
Then change the upload limit by editing following two parameters:
post_max_size should be greater than or equal to upload_max_filesize.
After 1.6, filemanager uses your website PHP to upload data. To change upload limit you need to change two parameters of your PHP.
Make sure post_max_size is greater than upload_max_filesize. Read this guide on how to change your PHP settings.
You need to change these settings for the PHP version your website is using. You can also change your PHP version through Modify Website.