How to change lines when writing excel content on the web. Or how to copy

I have a question~!
I am working on writing the content in Excel as type into the web. The content is long, so I wrote it by line break in Excel, but when I run it, it is written in a line without line break. Is there any way? Or is there a way to copy and paste cells instead of type into??

How did you type the line break? Can you try using Environment.NewLine