Exiftool
To fix the date time on the pixel 6a photo and video files, use for photos:
# exiftool '-FileName<DateTimeOriginal' -d '%Y%m%d_%H%M%S%%-c.%%e' *.jpg
for video files:
# exiftool '-FileName<FileModifyDate' -d '%Y%m%d_%H%M%S%%-c.%%e' *.mp4
To fix the date time on the pixel 6a photo and video files, use for photos:
# exiftool '-FileName<DateTimeOriginal' -d '%Y%m%d_%H%M%S%%-c.%%e' *.jpg
for video files:
# exiftool '-FileName<FileModifyDate' -d '%Y%m%d_%H%M%S%%-c.%%e' *.mp4