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Are you sure? For a long time I thought the limit was 2.5 MB
What dzungmobile quoted is about ad (banner) design, not forum posts. Posts cannot contain images unless they are hosted on third-party sites. And yes, they are limited to a maximum size of 2.5 MB.
Maybe alternatively you can invert them into doc and give it a number to upload them as img by then I believe they could all enter in single page instead of reserving a space.
Do you think about this @op and does it make sense to you as well?
Posting content as an image is not a good idea. It makes the content hard to access for some users (for example for users who rely on screen readers or inline translators) and is not search-engine-friendly. Text is much better for discussions and sharing information as it can be easily copied, quoted, or shared between platforms and different media.