A deposit appears in your history only when it is credited. Until then it is not shown on the site at all. Check the points below.

Is the transaction confirmed? Find it by its transaction ID (hash) in a blockchain explorer of the network. While the network has not confirmed it enough times, we cannot credit it. The number of confirmations needed is shown on the Receive page under the address. The time depends on the network and its load.
Same network? The network you sent over must be the one you chose on the Receive page. If not, see I sent crypto to the wrong network.
Right address? Compare it with the address on the Receive page for this asset and network.
Enough? Amounts below the Min. deposit shown on the Receive page are not credited.
Memo included? For networks that need a memo (tag), a deposit without it or with a wrong one is not credited automatically: What is a memo? Such deposits, and deposits over another compatible network, can often be recovered on request: Can a deposit that was not credited be recovered?
Is the network working? If the network is marked Suspended on the Receive page, crediting may be delayed. You do not need to do anything: the deposit is credited automatically once the network works again. Deposits or withdrawals on a network are suspended

Credited deposits are in Wallet → History → Payments (type Deposit) and on the Funding wallet, not on Spot.

If the transaction is confirmed and everything above is right, but the deposit is still missing, write to us through the support form. Include the asset, the network, the amount, the transaction ID and the date. Attachments are not accepted, so send everything as text.

Stay safe: Strade support never asks for your password, 2FA codes or seed phrase.

Why has my deposit not arrived?