As I understand, the daily digests are a round-up of the information or notifications that had happened. On the Workfront Help site, it indicates for daily digests, "All the events that meet the criteria of the notifications 24 hours prior to the selected time are emailed with the daily digest. You will receive one daily digest email for each notification area." There is also this Help page "Receiving Email Notifications" "https://support.workfront.com/hc/en-us/articles/231802907-Receiving-Email-Notifications">
https://support.workfront.com/hc/en-us/articles/231802907-Receiving-Email-Notifications , which has a detailed section on "Receiving Daily Digest Notifications", where it lists out items to be aware of when getting daily digests. Hope this helps out. Terry Hynd EBSCO Information Services