UE 5.8 primary sources

Verified 2026-07-19.

• Enhanced Input
• Enhanced Input API
• ETriggerEvent API
• UEnhancedInputComponent API
• Add Mapping Context Blueprint API
• UEnhancedInputUserSettings API
• UEnhancedInputDeveloperSettings API
• UPlayerMappableKeySettings API
• Register Input Mapping Context
• Save Settings
• Unreal Engine 5.8 Release Notes

Version note: UE 5.8 unifies Enhanced Input and Common Input/UI workflows and fixes state loss and re-firing around mapping rebuilds. Epic's current APIs expose UEnhancedInputUserSettings, player-mappable profiles, mapping rows/slots, failure reasons, apply, and save operations. The gameplay-buffer procedure in this skill is an explicit project-layer pattern, not a claim that Enhanced Input provides a built-in precondition buffer.