I would want to have the size given
Awesome that you listen to the people. I have 2 suggestions that i would like added.
I would want to have the exact size (1920x520) on the mockups so that i can design accordingly.
Also I would like to have a function when uploading to a mockup to snap-to-grid.
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Jordan Milgrom commented
I would really like to have way more options for standard US letter sizes 8.5 x 11. It's also hard to filter mockups by page size which is important if you want to be able to quickly find templates that fit the dimensions of your work.