These are the only BANNER sizes you need, to publish DESKTOP, MOBILE and Facebook RIGHT HAND SIDE ads with Retargeting Base:
728x90, 300x250, 160x600, 120x600, 468x60, 320x50, 300x50, 600x315 <<<< send THIS list to your artist.
The list below is just to show you how the sizes above are used in RTB:
Desktop: 728x90, 300x250, 160x600, 120x600, 468x60, 320x50
Mobile: 320x50, 300x250, 728x90, 300x50
Facebook: 600x315
Facebook ads exchange access is NOW working on right hand side ads!
MORE Facebook Access is under development, stay tuned!
Images Max file size: 150 KB Only JPEG, JPG, GIF, PNG
Video Max file size: 20 MB Must be MP4
Minimum height of 144 px
(In one of these ratios: 16:10, 16:9, 4:3, 5:2)
* If you do not have creatives, click on the Banner Creator in your left side menu, and get your set of Banners.