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Working with images is as easy as possible; creating variants to display images in different sizes might be the most common use case in a Rails Application. The image_processing gem is responsible for abstracting the complexity of creating an image variant, like resizing the image to be 300px on the longest side.
Underneath the image_processing gem, it uses ImageMagick or Vips to handle image operations and transformations; by default, it uses the first, ImageMagick..
A quick DuckDuckGo search about this told me what I already knew, no support out of the box for HEIC on Active Storage. Some work needs to be done to enable it. I came across this post, “How to generate HEIC previews in Rails using ActiveStorage”.