Error while uploading large files in SharePoint 2013 site

Hi, 

      Our application is SharePoint 2013 on-premise. Business is having one requirement to upload large files upto 1GB into the site. We used XMLHttpRequest calls to upload files.

For few of our users it is possible to upload large files, but for few it is not working. We have tired giving same permissions and tried same files to upload. But even in backend it is not working for them. 

'unable to upload at this time, please contact administrator', this is the error we are getting while uploading in backend itself. 

It will be great if any one could help. Thanks in advance

Nithya