Because all the data of blockchain is transparent, every transaction can be found on the blockchain browser, at blockchain.info. You can learn more about blockchain and bitcoin at blockchain.info.
If it the APP is showing a successful transfer in blockchain.info, but you didn't receive the Bitcoin in the imToken APP, please email us firstname.lastname@example.org.
We suggest that you learn how to query transactions in blockchain.info. Bitcoin is more complex than ETH, so it may take longer to find a solution to the problem using customer service.