Until 23.02 all our users successfully dowloaded docs from our internal file server. Our WS1 on premise environment is updated at last version. Issues in 23.03 version are related both to content published from (old) EIS and from last UAG release. Users that still use Content app 23.02 or older version can successfully dowload. Please check and solve. I can confirm you that Content app 23.03.1 solved the issue.