Build a Nightglow scene, watch it run, export it.
.zip you exported earlier, or a scene.json
with its images.
Pick one image for something still, or several at once for one animation — they become its frames, in filename order. You can also drag images straight onto the picture.
Nothing yet. Add the background first — it sits at the back.
Cost is the file's pixel size, not the size you draw it at. A small image stretched to fill the screen is cheap; a huge one shrunk down is not. A Roku has about 23 MB.
Only animate what moves. A candle flame as its own 8 frames plus a
still candlestick costs a fraction of one big sequence containing both.
Every frame the same size. Don't trim each frame to its content or the
character will jump.
Layers stack in the order above. A still can sit in front of an
animation — a curtain, a bed post.