Hi,
When you post a series of placemarks, it's interesting if you put them into a folder and post them together. Then, all the information will be available in one place, and people are less likely to miss something. Collections that are posted in folders are usually downloaded more than multiple individual posts, it's much more convenient for someone to download one file with 10 placemarks than to download 10 individual files.
If you want to add something else later, you can add it to the folder, re-save the folder, and edit your post to replace the kmz file, adding a remark either in the original post or in a reply to say what you've added.
Here's how to make a folder:
If you do this you should of course delete the first individual posts, in order to avoid duplicate placemarks in GE.
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