Hello,
Yesterday I have updated my discourse to 2.9.0.beta9 ( b18f1fefda ) and today I notice that I am not able to upload images when I try to do so it throws this error:
Sorry, there was an error uploading that file. Please try again.
How to fix this?
Are you out of disk space?
Do you see anything in the Javascript console?
Resolved! The upload json was blocked by adgurad disabled it and it works now. 
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