There are two SpellAnime Engines in GBAFE.
FEditorAdv engine and CSACreator.
FEditorAdv has only half the vertical size of the image available for BG.
Height: 160/2 = 80dot
FEditorAdv stores 80 dots vertically.
In actual battle, this is stretched vertically and displayed.
CSACreator operates in the mode of Height: 160.
If you use the compatibility mode of CSACreator, it will be the same method as this operation.
FEBuilderGBA allows you to import into FEditorAdv Engine even animations made for CSAcreator.
If the image is 160 dots vertically, it is realized by storing it down to 80 dots.
If you are using the FEditorAdv Engine and import an image of 160 dots vertically and then export, you will get an image that has been reduced to 80 dots vertically.
//The performance seems to be better with CSACreator, but I think the FEditorAdv Engine is more stable.
//For example, if you set multiple images after the miss-Terminate, there is a reduction that freezes when attacking with Hero or Sniper.
//(This is a problem that occurred in the version ported to FE8J, and it is not known yet whether it will occur in FE8U.)
//If you are interested, have a look at NGMation’s Discord.