Why did Mark Antony need Cleopatra's money and supplies for his Parthian campaign?

Mark Antony required Cleopatra’s financial support and Egypt’s resources to fund and supply his planned military campaign against Parthia.123

Antony, who controlled Rome’s eastern territories, sought to avenge the earlier Roman defeat at the Battle of Carrhae and recover the lost legionary standards. Because these military operations were exceptionally costly, he relied on the wealth of the Egyptian kingdom to sustain his forces. In exchange for this critical backing, Cleopatra negotiated the return of significant territories that had previously belonged to the Ptolemaic empire, including parts of Syria, Lebanon, and the Jericho region.4512