A: Hey there!
Thank you for your questions!

1. You can embed video from Google Drive as iframe to Text or on your website "home" page or content pages. For Image Gallery we support only Vimeo and YouTube links at the moment.
2. Though SpreadSimple wasn't designed as a blog builder, but you can still create a blog using Content pages or Details pages for blog posts.
3. We have site-wide password protection, so you can hide the entire website or just the content from Google Sheets (cards)