How to change intro cinematic character images?

I’m struggling to change the intro cinematic images for FE8. I’m talking about these ones specifically:

Despite these patch menus in FEBuilder, when I try to import new images, it just messes up all the graphics like this:

Is there an easier way to do this?

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Please attach the image you are trying to insert if you want help inserting it.

Or try exporting the vanilla image via feb, editing 1 pixel, re-importing it, and see if it still breaks.

OPANIM changes are not yet supported.
Do not change it.
Please turn off OPANIME, make that area disappear, and use it for the area where data will be placed.
It will free up about 800kb of space.