No, you should not attempt to deposit a $30,000 check using a mobile deposit feature. Such a large amount is well beyond the scope of mobile deposit technology, which is intended for smaller, routine checks. Attempting to deposit this amount through an app is highly likely to result in an instant rejection and could potentially trigger a review of your account due to the unusual nature of the transaction. For a $30,000 check, the only professional and secure way to deposit it is to visit your bank branch and hand the check directly to a representative. When you do this, ensure that you are fully aware of the bank's "funds availability" policy, as the institution will almost certainly hold the funds for several business days to clear the check through the issuing institution. This is standard procedure for large amounts and is designed to protect both the bank and you from potential fraud.