On January $1,$ Shemwell Co$.$ signed a security agreement giving Jones a security interest in a crane.$$ Shemwell was planning to buy for its business. In exchange for the security agreement, Jones signed a contract to lend Shemwell $$10,000$ on request. On January $9,$ Shemwell purchased the crane. On January $15,$ Jones delivered $$10,000$ to Shemwell. On January $20,$ Jones filed the security agreement with the appropriate public officials. Under the UCC, when did Jones's security interest in the crane attach?