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The image tag for the genny is super easy. Size your images in an image editor, for example, make the dimensions of your image 200x200. Save that file and upload it to your server. Point the url in the image tag to that file. All the rest is taken care of for you.
@adam
Then I copied the image url from Mastodon, open up Sovereign Feeds and went to the Image tag. Add a new tag, paste the url, and you're done, ready to create the RSS file with the new image.
Probably want to do it for both the podcast; i.e channel, and the episode; i.e. item.
@adam
I resized this one to a width of 200px using Paint