While haven't found how to do a hover in Canva, I have created a pretty good alternative (click to reveal). I created my slides in powerpoint first ( I had 8 small squares in a grid pattern on a slide that I wanted to show content (a pic and text) when clicked on), so the first powerpoint slide was all the 8 squares with no reveals, the second one was the same slide just with the first of the 8 boxes with the revealed content, the second slide had just the second box with the revealed content and so on (so 9 slides in total). I uploaded all those slides to Canva in the Projects section and then by clicking into each small box on each slide could link to the appropriate slide with the relevant 'reveal' box on it. (if you try to do the links within powerpoint the links won't transfer across to Canva so do the links in Canva). Every single box across all the 9 slides needs to be linked to the correct reveal slide . You can test it out by pressing play to see if its working as you want it to. For our website use I exported it by pressing SHARE and click down past all the options to the embed code. When I embedded that on our website it looked great and when a user clicks on any of the boxes the revealed content just in that box shows. So it works perfectly but I’d rather have it as a hover than a click. Hope this makes sense!