I transferred $200 from a Fidelity Investing account (where I have Cash {SPAXX} in a separate Quicken account), to a non-Fidelity account, just fine. After downloading transactions, the Fidelity Cash/SPAXX, and the non-Fidelity account show these properly cleared. HOWEVER, there's an odd transaction in the Fidelity non-Cash Quicken account, I cannot figure out how to code.
(There was also a mystery pop-up about tracking FDRXX as cash in the download. I had to go look at our 7 Fidelity accounts to learn it in my wife's IRA, so I opted not to track that one in a separate account. Also, I have to manually update my share balances in a Fidelity 401k after each download. SO tired of Quicken Issues with Fidelity.)