Make sure you're using the latest ReShade version, because the flipbook parameters may have changed since older versions. You can try resetting the flipbook parameters to defaults to see if it works at all with their default image. My rain flipbook image may also be too large to fit in memory (I had trouble with larger sizes myself). So you can try to resize the image smaller and update the flipbook resolution parameters and see if that works.
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Video - https://youtu.be/qbX5EsHXnPQ