Uploading to Amazon

2 questions:

1. I know @Thomas Umstattd Jr. recommends doing a separate Amazon account - but should I choose “Business Account” when setting up that 2nd account? Or can I set up a separate individual account and just use my LLC info?

2. @Thomas Umstattd Jr. also says have 3 files handy (cover jpeg, interior pdf, and .epub). I hired someone to do all this and don’t have a file with a .epub extension. What is that and how is it different from the cover and interior files?

Thank you!