File source & composite map

[Stager]

I have tiles with z/x/y.png structure and I see it as OruxMaps map with file:// source:

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<url><![CDATA[file://data/extSDcard/tiles/eniroTopo/{$z}/{$x}/{$y}.png]]></url>

It's fine but has a critical issue: such maps don't appear in ADD NEW MAPS -> COMPOSITE MAP map list.

Why?