Title search for bank-owned property, before or after bidding?

[Jeongmoon Park]

Hello,

I am new and am currently looking at a few bank-owned properties to buy in Columbus, Ohio. I learned that most of bank-owned properties have clear titles but sometimes not. So, it is still recommended to do title search to ensure it is really clear. My questions are,

1. When you buy a bank-owned property via online auction, do I need to do title search before bidding or can I still do it after bidding? 
2. If I do the title search after winning the online auction and find any issue on the title, would I be able to cancel it?
3. Would there be another ways you may suggest to find/buy bank-owned properties?

Thank you very much for your advice!

- Jeongmoon