here's metadata output by ffprobe:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'e:\tt\82_1526629849542.mp4':
Metadata:
major_brand : mp42
minor_version : 1
compatible_brands: mp41mp42isom
creation_time : 2018-05-18T07:50:18.000000Z
Duration: 00:00:10.74, start: 0.000000, bitrate: 829 kb/s
Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp,
89 kb/s (default)
Metadata:
creation_time : 2018-05-18T07:50:18.000000Z
handler_name : Core Media Audio
Stream #0:1(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, sm
pte170m/bt709/bt709, progressive), 480x360, 735 kb/s, 29.98 fps, 29.97 tbr, 600
tbn, 1200 tbc (default)
Metadata:
rotate : 90
creation_time : 2018-05-18T07:50:18.000000Z
handler_name : Core Media Video
Side data:
displaymatrix: rotation of -90.00 degrees
1.79 A-V: -0.028 fd= 1 aq= 30KB vq= 67KB sq= 0B f=0/0

As we can see, 'rotate : 90' in Metadata section

I uploaded test file here: http://test01.tourting.com/wer/82_1526629849542.mp4