When you create a new storyboard, you'll have an option to choose the aspect ratio that you'd like your frames to have. There are multiple options to choose from - 9:16, 16:9, 1:1, 4:5, 4:3, 1.85:1, 2.40:1.
We recommend that you upload images in these dimensions for best results, although other formats will be resized appropriately.
The maximum file size is 20MB. This applies to images uploaded into the frames and to the image you can upload for display on the front page of the PDF (i.e. instead of the Boords logo).