Hi Nathan Foster,
Thanks for posting your question here. This issue happens because Microsoft Designer it only accepts standard image types like PNG or JPG, while many copied items come in unsupported formats such as HTML, embedded objects, or unrecognized format
Here's what you can do instead of pasting it, you can reliably add images by dragging and dropping them onto the canvas or using the Add Image / Upload button. For best results, save or copy your image using tools like Snipping Tool or Paint first, and if the app acts up, just refresh or restart it.
Let me know if you have questions, I am here to help.
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Thanks,
Jobelle C.