When I try to enter a new message following my own message (post??), it always ends as an Edit to my previous message, instead of making a new one.

It does this whether I use Reply, Reply to Thread, or Advanced.

Is this how it is supposed to work?

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Ok, for example...
This is a "Reply to Thread". I would like it to be a new message, but... here it is in my original message!!

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Now, this is a Quick Reply.

It appears I cannot do anything but add Edits to my existing message, until someone else creates a new message in the thread. After that, I can create one new message.

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This is a "Go Advanced" message. I even entered a new Title for it. But the Title will not show up. And this will be added to my existing message.