通过SSIS将文件导出到sharepoint（UNC） - 拒绝访问

I am trying to export files by SSIS to sharepoint. I have create package that is working on my computer. When I upload it on the SQL Server (SSIDB database) and try to run from SSISDB catalog I got error "Access is denied". I have log in to SQL Server by Windows Authentication and my username. I have also log in to the database server (with my username) and try to create file in sharepoint directory and I have done that without an error. I can do that also by CMD script from server but when I try run this script in SSIS package deployed to SSMS I got an error "Access is denied". My UNC directory looks like: \sharepoint@SSL\DavWWWRoot\YYYI am trying to export files by SSIS to sharepoi