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I also used Photoshop to add the XMP

But it still not show up in filerun.

I have just double checked with exiftool

exiftool.exe -xmp -b test.png > a.xmp

It does contain the following XMP

<?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?>
<x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="XMP Core 5.6.0">
   <rdf:rdf xmlns:rdf="">
      <rdf:description rdf:about="" xmlns:dc="" xmlns:lr="" xmlns:photoshop="">

Here is a test file. 

I am using Docker with Software version 2018.11.11.

I have indexed the folder manually.

 Here is what I see in XnView MP.

I also used to confirm XMP exists.