The error:
Here's the image I was trying to upload: (uploaded thru imgur)
I was trying to upload the image to c/[email protected]
I found a github issue for this, but the discussion seems to point towards it being on your end or lemmy.world's end.
This likelihood jeans your upload is being detected as a false positive by the automated anti-csam filter that is validating each upload on lemmy.dbzer0.com. There's about 1% false positive rate especially around images with children or porn. Nothing we can do about this atm I'm afraid. You can to upload it to an external service and link it like you just did.