Question: How does one put an external photo into the MakeCode arcade?
I don’t think it is possible to upload image files in a game (.gif, .png, etc), but you can use https://riknoll.github.io/pxt-arcade-asset-tool/.
Just save the photo as a .png file and drag it from the computer to the page. Try not to make your files too big, as the ‘Copy’ button does not always work. Otherwise, within the box on the right, copy the text from where img’ begins until the last ’
My image is quite large, so you cannot see all the values representing a color from the palette.
Here is my profile photo as a sprite.
Is this what you are looking for?