XF 1.5 Image resizing

#1
Hello, in ACP > Options > Attachments I have file size set to 10MB and dimensions set to 1600 x 1600. From what I've read I understand that all images under 10MB uploaded should auto-size to 1600 x 1600 but this isn't happening and users are getting this error:

err.png

Is there something I'm missing? I contacted Nimbus and they said to raise the matter with Xenforo support.
 
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