If the tokens you sent from Plug Wallet to the NNS are not showing, it is likely because the tokens were neither ICP nor SNS tokens. The NNS only supports ICP and SNS tokens, so other Internet Computer tokens won’t be displayed or supported in the NNS.
To better understand the differences between Plug Wallet and NNS, you can read this article that explains how each wallet functions.
Recovering Your Tokens:
If you’ve mistakenly sent non-ICP/SNS tokens, view this video tutorial for recovery options. Note: Use this method at your own risk, as Plug Wallet is not the author of this method.