Ok - hopefully I can explain this clearly! There are 3 different types of schools I can think of:
1) Screening schools - these schools will send you a secondary after reviewing your VERIFIED AMCAS application if and only if they believe you qualify for their secondary.
2) Non-screening schools #1 - These schools will send secondaries automatically, but not until after your AMCAS application is verified. Often, they are sent immediately after the application is verified. However, some can take a few days.
3) Non-screening schools #2 - These schools send you a secondary when you SUBMIT your primary even before verification. As far as I know, this is least common among medical schools (I applied to 15, and none sent before verification).
Hope this helps! Let me know if it's confusing