Improved Mobile app

Shorter screenshot command instructions

The developer screenshot guide shows commands for the selected task and device.

The App Store screenshot option in the mobile command menu now separates first-time setup, repeat capture, caption and placement changes, single-image work, checks and other options. iPhone and iPad commands are shown for the selected device. Setup requirements, review instructions, Simulator selection, EAS builds and normal-build recovery remain available. The menu only prints instructions.