XF 2.0 Gigantic Images

Admin > Setup > Options > Attachments

In there you can set maximum dimensions. Images will automatically be resized to those dimensions.
 
What exactly did you change? The option wouldn't be referred to as "Attachment size". You're looking for this option:

1524738466125.webp

Setting it to 1280 x 1280 is probably reasonable. Again, it will only apply to new images uploaded.
 
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