I’ve sent 67400 siacoin from sia wallet to bittrex and no trace of any coins! The transaction is confirmed
I’ve had a similar issue, have you had any resolve?
Make sure your wallet is up to date as older version of wallet is not compatible with the current chain. If you can find the TXID on an explorer, the transaction is completed and you will see your coins after you are fully synchronised to the correct chain.
How to get to the correct chain: https://siasetup.info/faq/ui_and_wallet#fork_reset0
Find me on the Official Sia Discord.
Feel free to donate if I helped you!