Hello, been getting this pop-up when trying to drag an image (both saved images on my computer & images from web pages)

If anyone could help I'd appreciate it. Thank you.

Visual planning ideaboard, by indie devs, for indie devs and creatives · By
Hello, thank you for your reply. I downloaded the latest version for windows. I can paste now from my computer, but I can't paste from a png from a web browser (or copy/paste the image or image address and paste into MasterPlan), it doesn't show an error, it's just that it seems it ignores the attempt.