Take a screenshot or record your screen on your Android device
https://support.google.com/android/answer/9075928?hl=en

Take a scrolling screenshot
*** Important: These steps work on devices running Android 12 and up, on most screens that allow you to scroll.
1. Open the screen that you want to capture.
2. Press the Power and Volume down buttons at the same time.
3. At the bottom, tap Capture more.
4. To select the content you want to capture, use the crop guidelines.

After pressing " Power and Volume down buttons", you should see your phone screen is in picture mode. At the bottom of the screen, you should see couple buttons. The one with "down arrow = scroll down", you just tap it. And it will scroll down and same the message to one long photo file to your phone.