When I tried to get the file name, he didn't return, but the documentation says so, and you can check out the code I attached, these are the results of my tests using Google API Explorer, and I'm hoping to get an answer
curl \'https://youtube.googleapis.com/youtube/v3/videos?part=fileDetails&id=vNC1WNSL9XE&key=[YOUR_API_KEY]' \ --header 'Authorization: Bearer [YOUR_ACCESS_TOKEN]' \ --header 'Accept: application/json' \ --compressed Response:{"kind": "youtube#videoListResponse","etag": "aaxbFKP1TCIDrlDKNFJ7luuqtT8","items": [ {"kind": "youtube#video","etag": "v9FbMSHbI0Pdom1glHT8dTyaA2k","id": "vNC1WNSL9XE","fileDetails": {"fileType": "video","container": "mov","videoStreams": [ {"widthPixels": 1280,"heightPixels": 720,"frameRateFps": 30,"aspectRatio": 1.7777777777777777,"codec": "h264","bitrateBps": "5729890" } ],"audioStreams": [ {"channelCount": 2,"codec": "aac","bitrateBps": "240051" } ],"durationMs": "40200","bitrateBps": "5969941" } } ],"pageInfo": {"totalResults": 1,"resultsPerPage": 1 }}