How does iPhone copy some content in SMS?

Take the iPhone8 as an example. Copying some contents of "SMS" can be done in the following ways:

Open "SMS" on the mobile phone desktop first.

Second, after opening "Information", select the "SMS" to be operated.

Third, then press and hold the "text" that needs to be operated.

4. Click the "More" option to enter.

5. Click the "Share" icon in the lower right corner to enter.

6. Continue to press and hold "Text" to proceed to the next step.

7. Click the Select option.

Eight, select the required "part of the content" and click "copy" to copy.