I created an offline paper wallet, then use the view key to create a view-only wallet with "monero-wallet-cli --generate-from-view-key" command. My test send from an exchange to this wallet works, and show up the balance. What do I need to do to be able to send from this wallet?
You do the same, except using
monero-wallet-cli --generate-from-keys, which will use the spend key in addition to the view key.
You will be prompted for the information when you run this.
See a guide for using
--generate-from-keys here: If I saved my view key and spend key can I recover my wallet if my mnemonic seed is lost?