Hello Rebel,
It seems like the video showing a different username compare with the one that you posting in your site details here. I am able to logged into your site now.
It seems like there is some permission issue that cause the photo unable to be uploaded. I checked your 'Admin Tool' and it seems like there is no WAF exception for easydiscuss component. I have added com_easydiscuss in WAF exception from your admin tools and I am able to upload the photo now as an attachment. Refer discussion url here, http://therebel.website/en/forum/test-photo-upload
Hope these can clarify the issue