I'm using the official Stack Exchange mobile app for iOS or Android, and
- My app crashed!
- It doesn't look good on my new smartphone.
- It won't run after I updated my device.
- I noticed another bug.
- I have an idea for a new feature which is currently not in the app.
How do I report bugs with or request features for the iOS and Android apps?
Also:
- I've used the built-in functionality of the app to report a bug or submit a feature request. Did I do the right thing?
- The app prompted me to post on Meta after an error occurred. Should I post about it here?
- I'm wondering why the latest version is from 2017.
- I've heard rumors that the apps are no longer supported; is that true?
- I can't find the app on my device's app store anymore! Where did it go?
We get a lot of bug reports from users about the mobile apps, which are unsupported, and at the moment, there is no centralized Q&A pair for those to be closed as duplicates of (the relevant answers are spread across multiple unrelated questions). This question is an FAQ proposal, to serve as a directly-related duplicate target for those questions.