I tried to upload an image that is 1920 x 930 jpeg but the Upload progress never completed. I tried a small gif and success. Any size limit for the Tag’s Featured image?
The tags featured images are available in v.188.8.131.52 Mercury theme; after installing, if it still doesn’t work for you, it means that you override the config,json file, and need to merge with the latest version.
PS: The .gif or .svg files work because Publii does not generate thumbnails for this type of extensions.
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