When downloading files uploaded from the Android app, filename has non-ASCII characters stripped

[chrisbobbe]

If you upload a file from the Android app, then download it on any client, its filename will have non-ASCII characters (such as Korean characters) stripped out of it. We believe this is a symptom of facebook/react-native#31537. Rather than upgrade to RN 0.74 which has the fix, we plan to fix by releasing the zulip-flutter app, which doesn't have this bug.

Discussion: https://chat.zulip.org/#narrow/stream/9-issues/topic/.F0.9F.93.82.20Korean.20characters.20replaced.20with.20_.20in.20downloads.20.2331475/near/1934515