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Caching issue with images (not being updated when changed)
There is probably a caching issue you can reproduce simply:
Add an image to an animation, make edits in the image itself (with a graphic tool), when you now choose the image again for refresh (or even delete it and create a new one pointing to the same source) this image is still the same and you do not see the changes you made; I assume this is some caching error.
I had to rename the image to be able to include the edited image.