What is the file size upload limit for SharePoint online? the File upload limit for SharePoint Online in Office 365 Business Essentials and Office 365 Business Premium is 10 GB per file and file attachment is 250Mb. Note: In classic mode, upload methods other than drag and drop have a 2 GB limit. For more details check Limits for SharePoint Online in Office 365 Business Essentials and Office 365 Business Premium