You are unable to download non-English attachments from incidents after upgrade to 16.0RU2.
16.0RU2
There is an issue with downloading non-English attachments in the new Incident Snapshot page introduced in RU2.
Install 16.0RU2HF1 where the issue was fixed.
If you cannot install HF, you can also switch to previous Incident Snapshot page UI by following the below article - Toggle Incident Snapshot Pages (broadcom.com).