Why can't my Qiniu Cloud S3 attachments load in the forum after successful upload?

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Indeed https://img.i4ta.com/original/1X/5be788f6a5e3d0efa278e1e87b6c6ca6be2ce4cf.mp4 gives that error. You’ll need to check somewhere that people know about your to configure i4ta. I’m pretty sure that it has to do whey the configuration there.