If no video files are being created by VBOX Sim, there a number of steps that can be taken to try and rectify the issue.
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Ensure PC Based or External Device has been selected.
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If using an external video capture card, check that the capture card software has been installed correctly.
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If using an external video capture card, check that the external video capture card is correctly plugged in to the computer via USB and HDMI.
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If using the PC based built-in screen capture function, ensure the correct display has been selected.