I have the same problem with Kartra.com upload system. I’m getting mad with their help ticket because they can’t find a solution. 😩 I have macbook pro 13” with M1 chip. I tried different browsers, i disabled firewalls and all the extentions. When uploading (using developer mode with the console active) i get this message : Failed to load resource: the server responded with a status of 403 (Forbidden) And it shows this link Link - https://developer.apple.com/forums/content/attachment/d805a386-e383-49bd-89c6-c6cc62e78427 Could it be helpful to anyone?