If the app crashes or loses connection while pulling from the gacha, and the gacha results are not displayed correctly, any new characters obtained can be checked from the Characters screen, or found in the Green Room.
If you are unable to see which new characters you obtained, go to the Characters screen or Green Room > Sort Characters > Acquired. This will display the newest characters at the top.
If you have tried the above and still cannot see newly obtained characters, contact customer support from Menu > Support.