Filename appears on red background

Can anyone please tell me what the significance is of a red background to a filename? I’m looking at the grid of photos at the bottom of the screen while using the PhotoLibrary tab. One image filename shows as black text on a red background. All others are white on black. I imagine that Photolibrary is telling me that there is some of issue with this one image but… what?

If this post appears twice, apologies. I’ve just joined, I first posted this question two days ago. Maybe it’s not been moderated yet or maybe I didn’t press the right buttons.

Thanks,
John

Welcome to the forum, @jho

Check if you have added a colour label. If so, you can reverse it using the respective context menu item.

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Yes, that’s it. Thank you. I don’t use colour labels much so it wasn’t obvious (to me).

Thanks again,
John