problem changing avatar to custom

I'm new to the TN and I suspect I'm missing something super-obvious here, but I can't change my avatar to a custom picture. This might be linked to a (possible) problem with my pictures, I don't know. When I look at the pictures I've uploaded and look at the status it says "unknown" and classified as "N/A"I don't know what any of this means, can anyone enlighten me?Thanks!

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