Have you tried adding more specifications? Your overlay may be behind a certain layer, at opacity 0 or in a different zone.
&overlay EMMAS ARM create
&overlay EMMAS ARM scales to 1.000 1.000 in zone 1 in 0
&overlay EMMAS ARM shifts to 0 0 in zone 1 in 0
&overlay EMMAS ARM opacity 1 in 0
&overlay EMMAS ARM to layer 1
You can use these codes in you’d like to and substitute the coordinates, sizing, zone number etc to fit your scene. Alternatively, you can add it to your background:
INT. BACKGROUND with EMMAS ARM to 1.000 0 0 in zone 1 at layer 1