Not 100% sure if this will help but I am currently using the Hype Document Loader approach to preload images in a project. One downside is you need to keep an eye on setting the build number correctly and updating it if you reuse the file with a newer Hype version later on. In this particular case I was thinking about using the HypeDocumentRender event provided by the extension you can render Hype files at any given time. But just adding the Hype script delayed is probably the simpler solution. Just sticking it in this thread as an option.
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