Do you have a microbosh & full bosh? bosh upload release debug log is from your micro to which you uploaded your bosh release (see at the end where it says uploaded bosh release successfully). that task succeeded.
Assuming answer is yes. What you want is to target your fullbosh and get debug task log from there.
Usually cf-release upload fails because there is not enough ephemeral or persistent disk is available. Now days cf-release is few GBs so you might want to increase disk sizes.