Partial or full text copying of text is not possible.

[hiragiyayoi]

Problem

If you try to copy a long document in markdown format, you can only copy up to the point where markdown notation is not used.
And, it can not be possible to select a portion of the text.

Usage environment:

OS: windows11 23H2
Select Windows XP (Service Pack 3) in compatibility mode

The same behavior is true even when compatibility mode is not selected.

[iProgramMC]

Do you mind sending me the complete content of the message (or a reproduction which works the same way) that you are trying and failing to copy?

Also, have you tried right clicking the message and clicking "Copy Message Text"? That should copy the entire message's contents.

[hiragiyayoi]

Upon rechecking, we found that the reason we could not copy the full text was because the paste destination was not designed to recognize the sentence after the line break.
However, is it a specification that I cannot select a part of the text as shown in the following image?

model sentence

Once upon a time, there was a man named Taketori no Ou.
He went into the fields and mountains and picked up bamboos,
He used them for all kinds of things.

## continued
He was called Sanuki no Zouzou.
Among these bamboos, there was a shining bamboo.
When he was anxious to see it, he approached it and saw that it shone inside the tube.
When I looked at it, I saw a person about three inches long,
It was a man of about three inches in length, and he was very cute.

[hiragiyayoi]

Copying is done by clicking on “Copy Text” in the image below.