UPDATE: After several hours, the second transaction is now showing up on BlockCypher.
I sent some bitcoin from my Bitcoin Core wallet to my Exodus wallet. The first time, I tried lowballing the fees and the transaction was eventually dropped (not showing up in blockcypher or other sites).
-zapwallettxes I was able to successfully recover the bitcoin.
After sending the bitcoin a second time (using the recommended fee), the second transaction is not showing up in blockcypher at all. The status shown in Bitcoin Core is "0/unconfirmed, in memory pool". Any help would be greatly appreciated, thank you.
EDIT: My transaction ID is
115c77086608cab30b92bab4316920787be8a886a5018f5d2eb5512a49a7b6f6; again, it doesn't work on the several blockchain explorer sites I've used.
EDIT 2: After running
-zapwallettxes again, the transaction disappears and the bitcoin shows up in my wallet. However, after I remove the command, the transaction re-appears.