Photo is optional; any JPG/PNG/HEIC works — it's converted and resized automatically. Transparent PNG cut-outs look best. No photo → the eagle statue is shown.
Plays on the board every time someone enrolls (MP3, WAV, M4A or OGG, up to 20 MB; keep it under ~6 seconds). Without one, the board uses its built-in cha-ching.