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I tried that and had no luck, also searched through all the files in the affected folder and none of them have any pictures attached to them. Even when I have other .jpg in the folders and select next source it doesn't remove it!
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The sources list is used in the order that they are shown so that the 1st on is checked then the 2nd etc.
You sources list falls back to ANY picure in the same directory, if you don't what it to do this remove this line:
-match:$replace(%_path%,%_filename_ext%,)*
And adjust your Soruces to look like:
$replace(%_path%,%_filename_ext%,)folder.png
$replace(%_path%,%_filename_ext%,)folder.jpg
-components\default.png
This setup will look for folder.png then folder.jpg then use the nocover image.
If you want you can replace the first two lines with
match:$replace(%_path%,%_filename_ext%,)folder.*
and it will match folder.jpg|.png|.gif|.bmp
Also just so you know sources starting with a '-' are sub sources and so are skipped when choosing 'Next Source'.