Thank you so much for your time in responding! I can't believe I never realized that my transaction leading to the subsequent transactions would affect the subject transaction. That is fascinating. I have always bragged on behalf of my favorite wallet, copay, for their allowance of spending unconfirmed funds. Is this a show of smoke and mirrors? Are they claiming to do the impossible? Thanks so much for writing back!
Spending from unconfirmed funds is generally ill-advised because it can cause situations like the one you are currently stuck in. However, it is not impossible to spend from a unconfirmed transactions, but it also is not as safe or as user friendly as spending from confirmed transactions.