TinyIMG is able to automatically compress Product, Collection, Asset, and Blog Post Featured images.
Unfortunately, it’s not possible to compress any other images you may have stored in Shopify within the “Files” section in “Settings”. This includes blog post and homepage images. TinyIMG (like all Shopify apps) is not allowed to access this area, hence the reason such images can’t be optimized. If you want to optimize your blog post, homepage, and any other images, you can still do so manually.
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To do this, upload your chosen images to the Manual File Uploader first to optimize them. Download them once optimized and then you can upload them to Shopify.