The maximum file upload size for SharePoint 2013 on-premise (sharepoint.uiowa.edu) is 250mb. This limit applies to individual files or multiple files uploaded at the same time.
This is a system-wide setting and cannot be adjusted on sites.
Please note the amount of overall file storage on a site is based on a site-specific storage quota, which varies by site. Please contact your local/departmental SharePoint Site Admin for information on the storage quota for a particular site.