Problem : I am trying to upload a file of size 50 Mb plus in SharePoint 2013 document library on Safari browser using MAC but getting error. File size less than 50 Mb getting uploaded successfully.
This is due to your SharePoint uploaded file size is limited to 50MB. Please increase file upload size . Check below steps
Central Administration >>Manage Web Applications>> Select desired web application row (don’t click on the title, just select) “General Settings”
in the ribbon Under Maximum Upload Size, change the setting to the desired value (e.g. 200 MB in our example)