How to recover video file which got corrupted after force stopping trimming process?

I made a video of about 1 hour on iPhone X and was trimming it short and cancelled the process in between. Now the video file in Photo's app shows not supported and the time stamp has also gone. When I check the iPhone storage from Settings, the video size still shows 5.25GB but when I try copying the video to my Windows PC, it shows only 555mb (which is corrupted, tried repairing it). How to get the backup file which is 5.25gb size showing in Settings app. Please help!