“I can’t” doesn’t tell us much about what is going on.
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What happens instead of it pasting successfully? Nothing is pasted? The wrong thing is pasted? It looks like it’s pasted, but invisible? Or …?
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What does “I tried to change the format” mean, and how does it factor in to what you’re reporting?
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Are you using the mouse/right-click context-menu items or keyboard shortcuts?
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What if you try to paste it somewhere else, like in a notepad/text file – does anything show up there? If not, it might be a copy issue, like you’re not picking up what you expect.