Welcome Jean Sun,
Thanks for reaching out to Microsoft Q&A Forum. I understand that videos transferred from your phone are in HEVC format and cannot be played on your Windows PC.
Could you confirm:
- Which app are you using to play the videos (Media Player, Photos, Movies & TV, or another app)?
- Do you receive any specific error message when opening the file?
In the meantime, you can try these steps:
Option 1: Test the video in a different Windows app
- Try Media Player
- Try Photos if it is a video recorded on a phone
Option 2: Reset the Media Player app
- Open Settings > Apps > Installed apps
- Find Media Player
- Select Advanced options
- Choose Repair, then try the video again
Option 3: Check the video properties
- Right-click the video file
- Select Properties > Details
- Share the file type and codec information if available
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