[pkscout]

However, I am wondering about how best to optimise use of your add-on. Should I leave it set to download the images downloaded on the box as it does by default, or should I use your other add-on to move them to the NAS? - I don't understand the pros/cons of this. How does your add-on work? Does it download the images from internet sources only on the first playing of an artist, and then they are stored locally forever and the add-on only looks externally when a new artist is played? Or are they downloaded from internet sources freshly every time that artist is played. I have a large music collection on the NAS, and there's much more storage space on there than the Chromebox which has Kodi. In time I may also add another Kodi instance in my house, in this case would storing the Artist Slidshow fanart centrally on the NAS be advantageous?

Where the images get stored is really personal preference. If the drive where you have the Kodi user data files is really space constrained, moving them to your NAS would help. It would also help in the case where you have two Kodi clients. Other folks move the files because they have a bunch of art already from other sources and want everything in one place. Here's basically how AS works when a song starts:

1- check to see if image list files exists (one for each source you active in the settings) for the playing artist (or artists)
2- if one exists, check to see if it's more than 2 weeks old
3- if none exists or is older than 2 weeks old, refresh it
4- download the images that don't already exist locally (either in the user data location or in the local artist directory you specified - i.e. your NAS)

So once an image is downloaded, it is never deleted (unless you have the cache manager turned on in the advanced settings).