iPhone / iPad: Settings → the About section at the bottom → Diagnostic Reports. Mac: Settings → About → Diagnostic Logs…. Apple TV has no diagnostics entry.
Open Settings
Find the About section
Tap Diagnostic Reports (Diagnostic Logs… on Mac)
Tap Send to the author
Overview
iPhone / iPad: Settings → the About section at the bottom of the list → Diagnostic Reports. Mac: Settings → About → Diagnostic Logs…. Apple TV settings have no diagnostics entry.
Full steps: Collect and upload a diagnostic report.