Recording succeeded but the export button is invalid.

Hello, I set up background recording for 120 minutes while playing CS2 game, and it worked well. However, when I tried to export some video clips later, there was a problem. I couldn't export normally, and there was no error message. When I pressed the export/share button, it didn't work. I tried repeatedly, but it still didn't work.
After repeating it dozens of times, it suddenly displayed an error message saying that the recording save failed, and the background recording that I could originally see was not displayed. However, after refreshing, I was still able to see the background recording, but I was unable to export or share it. I can provide a video file of my inability to save the keystrokes as invalid, if u need.
Please help me!