Ability to edit CMS Photos from designer

It would be great if we could establish control of photos that are being used by the CMS. And it would be great if the Webflow University explained that if using the CMS for photos that photos need to be exact size and saved as PNG (not Jpegs which s a typical go-to). I am still having issues with the photos unnaturally zooming in when imported from CMS. When I place exact same photo and size, it looks stellar on all non-CMS pages. I noticed there was post by someone who was having the same image blurring issue I had and the response was helpful and lengthy, but for the novice (like me) I never would have figured anything out without support or the designer helping me. And could have saved at least 2 days of work if I had full control over CMS photos in the designer.
Thanks for reading!