If a customer uploads attachment in the solution with special character comma ; it throws error ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION; when user removes comma it works fine.
Comma is required in the naming convention.
It is reproducible environment i.e.11.2.12 and V12x.
When customer try to download the file he gets this error.
The issue with chrome due to security measures it avoid us to do that.
Bug reported in chrome community : https://bugs.chromium.org/p/chromium/issues/detail?id=103618.
So below are the workarounds we can suggest :
1) Since its browser specific you can use IE/Mozilla/edge for downloading the file. You can right click on attachment link copy it and open in IE/Edge/Mozilla for downloading
2)Or You can replace the , with other character like _ .