I have Bitcoins (or Ethereum, etc.) deposited, but it did not appear on my account

The main reason of the delay is the nature of cryptocurrency transactions. We expect to receive two (or more) confirmations to treat the transaction as valid and finalized. This make take a while and the delay depends mainly on the transaction fee you designated on it. The higher the fee the sooner the transaction will be confirmed by network.
In some cases the transactions are being screened manually (especially if the amount is significant). This also takes some time.
If however you do not see the transferred amount on your balance the next working day, please send us a screenshot of the transaction so we can trace it and process the deposit manually if necessary.