csharp: fix view mode on upload
csharp: fix view mode on upload

ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration,ONLYOFFICE/document-server-integration