Hello Andrey,
 
I’ve sent sample images to support email. Let me know if you received it or use this link to dropbox
https://www.dropbox.com/t/DKtdeOewlnfLFRmb
 
Basically you can detect panoramas by EXIF tags. 
Most 360 panoramas have: 
GPano: ProjectionType equirectangular
Also 360 degree panoramas always have 2:1 W:H ratio