to update the excellent instructions by @Anonyme from 2020 to January 2022 screenshots (dark mode)
Make developer mode visible - enter PIN, then goto Settings → System
Enable developer mode and tap “Bugreport”, create Full Report. Wait a minute until a “tap to share” notification is shown
Bugreports contain sensible data, do not share with the world. A person helping can reduce the report to the relevant log lines and share only those publicly.
If you have a mailaccount setup, share directly or see second section how to find the files again
If you skip the “tap to share” screen and want to find the Bugreport files again. Access via “Files” → “Recent files”.
Make sure to include the ZIP archive when sharing via Mail or copying to a synced Ecloud folder (“Pictures” for example).
(I think a user guide could be added or linked to the adb-only instructions at https://doc.e.foundation/support-topics/create-a-log)