Once you hit Send on the app, the transaction will be passed over to the network and where the miners or validators process it. The confirmation of a the transaction can take from minutes to just seconds depending on the network. Once you see confirmations, then this is an indication that it was accepted by the network and has been permanently added to their blockchain.
In the event that the transfer is not showing on the receiving end, here are some steps that can help:
Step 1 - Confirm the Destination Address
Sometimes overlooked but this has to be verified first. Check where the crypto was sent. Is the address correct? Review the transaction and confirm if it was actually sent to the correct receiver.
Step 2 - Does the Receiver Need a Memo or Destination Tag?
With centralized wallets that are on exchanges, a Memo or Destination Tag are always needed. This helps them in keeping the costs low for maintaining several wallets and for easier management. If you forgot to include this information then you need to contact the receiver. In most cases, exchanges will need to confirm that you are the real sender, before they can credit your deposits.
Step 3 - Does the Receiver Support The Crypto?
There are over a thousand cryptocurrencies out there. Some wallets or exchanges may or may not be supporting the crypto that you have just sent. Always check the name of the crypto not just the ticker symbol. One example is the ERC20 token with the symbol (HOT), it is shared by several projects.
There are also some instances that the receiving addresses looks similar to an ETH address (which is widely used by ERC20 tokens). But in reality, the token was already swapped and is already on a different blockchain.
Step 4 - Contact the Receiver
After going thru all the steps and you are certain that you have submitted the transaction properly, the next step is to contact the receiver. If the recipient is another wallet app or an exchange, then please reach out to their support team. The app has successfully done its job and has sent your crypto.
However, if the receiver is also using Trust Wallet, then please refer to this guide: Did Not Receive Coin or Token