We currently have a page that shows a preview of another page (newsletter) on an iFrame the moment the file is uploaded.
Is this better versus providing a button that says "Preview", which when clicked, will open the preview page in a pop-up / new tab?
I am asking this because although the current one we have removes the extra step of clicking "Preview" (since they see it immediately on the same page), I feel distracted by the other UI elements surrounding the "preview" section. Plus, that there are two scrollbars (the browser's and the iFrame's). And also, I would always see the preview even if I don't need to if I'm on that page.
Contrast that with seeing the preview on a new tab or a pop-up, I see the "Preview" on its own. I find it easier to review the "preview" page although I needed to click a button before seeing it. And I only see it when I want to.
Are there any UX guidelines regarding this? Is a pop-up better in this example?