Embedded smart object - canvas size altered upon creation?

alright i'm using video timeline , newest version of photoshop cc 2015.5 or whatever, , trying make animated gifs, i'm having issue smart objects. okay first color footage, crop , resize it, , add effects, , when i'm done add video layer, called hearts overlay, has moving hearts on it. use command-t resize hearts overlay fit within smaller canvas, , looks good, so:

 

now want make these things smart object can adjust timing of gif without having drag every single layer. highlight them all, , create smart object, find reason gradient effect has shifted. open embedded smart object created find changed canvas size accommodate whole resized canvas size hearts overlay layer, why gradient shifted, because it's operating on larger layer size.

what causing , how can fix it? if highlight hearts overlay layer , make smart object , drag hearts overlay layer embedded smart object manually, cropping not affected, kind of pain , i'm trying figure out causing this. thought since had canvas size set, when made embedded smart object use same canvas size , not change adjust other elements extend past bounds of canvas? mean, it's not can delete cropped pixels, since i'm dealing smart objects, i'm not sure here...

hi - couple of suggestions -might- be:

1) try linking layers before creating smart object, highlighting them , going layers panel drop down menu , choosing link layers

2) convert layers except gradient effect (the 1 that's shifting) smart object. highlight smart object , gradient effect layer , convert of smart object.

 

best,

steve

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