How to actually read an iOS crash log
Exception types, the crashed thread, symbolication, and the two entries in the crash list that are not crashes at all.
"It only happens on that one phone"
A checklist for the bug that reproduces on exactly one device — iOS version, storage, thermal state, battery health, profiles, and the ones nobody thinks to check.
What is actually inside an iOS app sandbox
Documents, Library, Caches and tmp — what iOS backs up, what it deletes without asking, and why "the cache will not clear" is usually a directory choice.
A real-device QA workflow that produces reproducible tickets
What to capture while a bug is happening, so that the ticket contains evidence instead of a description — logs, timings, device state and screenshots.