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Images shouldn't, by themselves, cause any issues with file-size limits. At least, not as far as I'm aware?? But... those older systems might have separate image size limits.
There have been a few threads here that discuss how to minimize image size while keeping acceptable quality - even for hi-res images. For example, I see images of the title page that are 250KB...I either convert them to straight text and trash the image, or, if there is some special graphics on the image I can usually reduce it to about 50KB or less without discernible loss.
Most of my epubs finish up in the sub 1MB range....unless there are specific chapter head images or somesuch...those can jump up to 1.5MB. Other than my CDO (OCD in proper alphabetical order) drive to minimize space, the total size doesn't really matter as much as the size of the individual files - which I wouldn't expect a problem if you break up the chapters into individual files.
Cheers,
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