What to consider when uploading thumbnails? Daniel Frithioff-Petersen Created on September 26, 2016 17:38 | Updated on September 26, 2016 17:38 Follow For optimal rendering of a thumbnail it should be formatted as a square with the maximum size of 400 pixels per side. Related articles How to change the display of content items to read the full presentation name? What is the size limit for a presentation? Engager 1.4.15 for Rainmaker (iOS) Comments 0 comments Please sign in to leave a comment.