Issues with Autogenerated Images

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How long have you waited after creating the libraries, running the initial scan, refreshing the metadata to grab images, etc...? I know for me, the cover art for libraries never popped up immediately. It seems to be tied to a scheduled task that runs on a schedule. Have you left it to sit for 24 hours after making changes to see if it will automatically cycle through cover art? I made zero changes at all and with the default configuration, my libraries eventually had cover art from my poster images. It cycles out every now and then (I have never timed the gap between when it changes, however).

You may be able to force cover art through refreshing metadata and searching for missing images, though if your libraries are like mine, I prefer not to do so...