I transferred some bitcoins from one of my online wallet to my Trezor. When the transaction is in unconfirmed mode I unplugged my Trezor. Then after I plugin my Trezor that transaction somehow did not show up on my Trezor. Now what should I do?
If the transaction has confirmed, then there is nothing that you need to do. Your Trezor device does not actually receive the transaction nor does it need to. All that matters is that the wallet software that you are using knows about the transaction, and if the transaction has confirmed, it is trivial for it to find out about the transaction. Check the wallet software that you are using and make sure that you see the transaction there.