Is this an official sumokoin wallet? If it's yes please announce on here, I won't dare import my recovery seed into an unofficial wallet that might have access to the imported seed.
Install wallet not from the official website is very risky. Bad event your assets will disappear. See the official Twitter Sumo at:
https://twitter.com/sumokoin right they released an android wallet. You can check at
https://twitter.com/sumokoin/status/1270021646779375616?s=20.
I got this official sumo twitter address from
Coingecko. I do not help promotion, just investigate.