I came across this issue when trying to use AutoAtlas .pac files. It is automatically trimming empty space around images(pngs) that I’m atlas-ing together. This causes them to be different dimensions from their original files
I would prefer if there was an option to specify that the atlas would use the exact dimensions of the png(s) instead of trying to trim them first.
I believe I found a solution to this by setting png properties in Assets tree view and setting Trim Mode to Custom, all 0 values, except for Trim Width and Trim Height to match w/h of image.