Correct usage of the "Insert More Tag" ?

I think I might have a incorrect understanding of how the “Insert More Tag” link works.

I’ve been using it in the following way: I write some text, add a picture, then I put in the “Insert More” tag. At that point I keep on going on the same page, below the Insert More tag, with more text and/or more pictures. My assumption is that the tag acts kind of like a page break in Word…that the input before the tag shows up on the main post page and then when the link is clicked the reader is taken to the entire post on a different page.

Is that how this is supposed to be used? If so, it doesn’t always work correctly…and I have to do some more testing to figure out how to explain what’s not working right. (that will be for a different post…) In the meantime, I’m just checking in with all you forum experts to see if I’ve got the first part right! If I don’t, I’d really appreciate a brief explanation of what the Insert More tag is supposed to do and how to use it.

Thanks in advance for any/all help.