if it should look like a gif = endles loop animation than it is not about layering but about animating them.
I have and aimated intro and all the overlays are on the same layer.
The way I did my intro to make the animated loop:
(I have full screen overlays so I didn’t need to move it or scale it…if you do, do all of them before the looping command)
&overlay INTRO_01 create
&overlay INTRO_02 create
&overlay INTRO_03 create
&overlay INTRO_04 create
&overlay INTRO_05 create
&overlay INTRO_06 create
&overlay INTRO_07 create
&overlay INTRO_08 create
&overlay INTRO_09 create
&overlay INTRO_10 create
&overlay INTRO_11 create
&overlay INTRO_12 create
&overlay INTRO_13 create
&overlay INTRO_14 create
&overlay INTRO_15 create
&overlay INTRO_16 create
&overlay INTRO_17 create
&overlay INTRO_18 create
&overlay INTRO_19 create
&overlay INTRO_20 create
&overlay INTRO_21 create
&overlay INTRO_22 create
&overlay INTRO_23 create
&overlay INTRO_24 create
&overlay INTRO_25 create
&overlay INTRO_26 create
&overlay INTRO_27 create
&overlay INTRO_28 create
&overlay INTRO_29 create
&overlay INTRO_30 create
&overlay INTRO_31 create
&overlay INTRO_32 create
&overlay INTRO_33 create
&overlay INTRO_34 create
&overlay INTRO_35 create
&overlay INTRO_36 create
&overlay INTRO_37 create
&overlay INTRO_01 moves to layer 1
&overlay INTRO_02 moves to layer 1
&overlay INTRO_03 moves to layer 1
&overlay INTRO_04 moves to layer 1
&overlay INTRO_05 moves to layer 1
&overlay INTRO_06 moves to layer 1
&overlay INTRO_07 moves to layer 1
&overlay INTRO_08 moves to layer 1
&overlay INTRO_09 moves to layer 1
&overlay INTRO_10 moves to layer 1
&overlay INTRO_11 moves to layer 1
&overlay INTRO_12 moves to layer 1
&overlay INTRO_13 moves to layer 1
&overlay INTRO_14 moves to layer 1
&overlay INTRO_15 moves to layer 1
&overlay INTRO_16 moves to layer 1
&overlay INTRO_17 moves to layer 1
&overlay INTRO_18 moves to layer 1
&overlay INTRO_19 moves to layer 1
&overlay INTRO_20 moves to layer 1
&overlay INTRO_21 moves to layer 1
&overlay INTRO_22 moves to layer 1
&overlay INTRO_23 moves to layer 1
&overlay INTRO_24 moves to layer 1
&overlay INTRO_25 moves to layer 1
&overlay INTRO_26 moves to layer 1
&overlay INTRO_27 moves to layer 1
&overlay INTRO_28 moves to layer 1
&overlay INTRO_29 moves to layer 1
&overlay INTRO_30 moves to layer 1
&overlay INTRO_31 moves to layer 1
&overlay INTRO_32 moves to layer 1
&overlay INTRO_33 moves to layer 1
&overlay INTRO_34 moves to layer 1
&overlay INTRO_35 moves to layer 1
&overlay INTRO_36 moves to layer 1
&overlay INTRO_37 moves to layer 1
&overlay INTRO_01 opacity 1 in 0.1 THEN overlay INTRO_37 opacity 0 in 0 THEN overlay INTRO_02 opacity 1 in 0.1 THEN overlay INTRO_01 opacity 0 in 0 THEN overlay INTRO_03 opacity 1 in 0.1 THEN overlay INTRO_02 opacity 0 in 0 THEN overlay INTRO_04 opacity 1 in 0.1 THEN overlay INTRO_03 opacity 0 in 0 THEN overlay INTRO_05 opacity 1 in 0.1 THEN overlay INTRO_04 opacity 0 in 0 THEN overlay INTRO_06 opacity 1 in 0.1 THEN overlay INTRO_05 opacity 0 in 0 THEN overlay INTRO_07 opacity 1 in 0.1 THEN overlay INTRO_06 opacity 0 in 0 THEN overlay INTRO_08 opacity 1 in 0.1 THEN overlay INTRO_07 opacity 0 in 0 THEN overlay INTRO_09 opacity 1 in 0.1 THEN overlay INTRO_08 opacity 0 in 0 THEN overlay INTRO_10 opacity 1 in 0.1 THEN overlay INTRO_09 opacity 0 in 0 THEN overlay INTRO_11 opacity 1 in 0.1 THEN overlay INTRO_10 opacity 0 in 0 THEN overlay INTRO_12 opacity 1 in 0.1 THEN overlay INTRO_11 opacity 0 in 0 THEN overlay INTRO_13 opacity 1 in 0.1 THEN overlay INTRO_12 opacity 0 in 0 THEN overlay INTRO_14 opacity 1 in 0.1 THEN overlay INTRO_13 opacity 0 in 0 THEN overlay INTRO_15 opacity 1 in 0.1 THEN overlay INTRO_14 opacity 0 in 0 THEN overlay INTRO_16 opacity 1 in 0.1 THEN overlay INTRO_15 opacity 0 in 0 THEN overlay INTRO_17 opacity 1 in 0.1 THEN overlay INTRO_16 opacity 0 in 0 THEN overlay INTRO_18 opacity 1 in 0.1 THEN overlay INTRO_17 opacity 0 in 0 THEN overlay INTRO_19 opacity 1 in 0.1 THEN overlay INTRO_18 opacity 0 in 0 THEN overlay INTRO_20 opacity 1 in 0.1 THEN overlay INTRO_19 opacity 0 in 0 THEN overlay INTRO_21 opacity 1 in 0.1 THEN overlay INTRO_20 opacity 0 in 0 THEN overlay INTRO_22 opacity 1 in 0.1 THEN overlay INTRO_21 opacity 0 in 0 THEN overlay INTRO_23 opacity 1 in 0.1 THEN overlay INTRO_22 opacity 0 in 0 THEN overlay INTRO_24 opacity 1 in 0.1 THEN overlay INTRO_23 opacity 0 in 0 THEN overlay INTRO_25 opacity 1 in 0.1 THEN overlay INTRO_24 opacity 0 in 0 THEN overlay INTRO_26 opacity 1 in 0.1 THEN overlay INTRO_25 opacity 0 in 0 THEN overlay INTRO_27 opacity 1 in 0.1 THEN overlay INTRO_26 opacity 0 in 0 THEN overlay INTRO_28 opacity 1 in 0.1 THEN overlay INTRO_27 opacity 0 in 0 THEN overlay INTRO_29 opacity 1 in 0.1 THEN overlay INTRO_28 opacity 0 in 0 THEN overlay INTRO_30 opacity 1 in 0.1 THEN overlay INTRO_29 opacity 0 in 0 THEN overlay INTRO_31 opacity 1 in 0.1 THEN overlay INTRO_30 opacity 0 in 0 THEN overlay INTRO_32 opacity 1 in 0.1 THEN overlay INTRO_31 opacity 0 in 0 THEN overlay INTRO_33 opacity 1 in 0.1 THEN overlay INTRO_32 opacity 0 in 0 THEN overlay INTRO_34 opacity 1 in 0.1 THEN overlay INTRO_33 opacity 0 in 0 THEN overlay INTRO_35 opacity 1 in 0.1 THEN overlay INTRO_34 opacity 0 in 0 THEN overlay INTRO_36 opacity 1 in 0.1 THEN overlay INTRO_35 opacity 0 in 0 THEN overlay INTRO_37 opacity 1 in 0.1 THEN overlay INTRO_36 opacity 0 in 0 loop INFINITE times