Inserting a photo of a certain shape

I need to insert a photo into a frame but I want it to be a polygon shape that I cant do with cropping alone. I tried to use mask to fill in the shape but I cant insert the file of the photo into the fusion nodes to merge it into the media line. Is there a way that I can do that or another way in general to cut a photo in a polygon shape?

Use a Polygon Mask tool on the Effect Mask input of the Loader. Like so:

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