Where are crontab -e settings saved in ubuntu 16.04? Working, but can't find [duplicate]

I created a cron job by invoking:

# crontab -e

but I can't find the file with my edits.

Here's the /etc/crontab file:

# m h dom mon dow user  command

117 *    * * *   root    cd / && run-parts --report /etc/cron.hourly1

25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --repo$
47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --repo$

52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --repo$

crontab -e shows

*/2 * * * * /home/avery/Dropbox/Scripts/lftp_download.sh

Anybody know which file my edits might be? I've looked at most the cron-related files in /etc but I can't find the one that's loaded when I type crontab -e.

Also, is there a log file in Ubuntu for cron?

Thanks in advance, Avery