In Filezilla all file icons are blank white

Title says it all really, in the file lists in Filezilla only folders have coloured icons, all the files have blank white icons, which makes it difficult to tell them apart.

I am using XFCE and I have tried using Settings Manager -> Appearance -> Icons to change the icons but that doesn’t make any change - in fact it doesn’t seem to change anything.

I tried to add an image but the system wouldn’t let me.

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