On the WebKit Bugzilla, I am unable to upload files as attachments, as after clicking Submit the website returns error 413. This has been tested on WebKitGTK (Epiphany) and FireFox.
How big are the attachment files you were trying to upload?
Was able to reproduce with a 9.5MB file.
Updated limit at ingress controller which seems to be the one giving 413.
Created attachment 465434 [details] Test uploading a 9.5MB file.
Created attachment 465440 [details] Test uploading a 15.3MB file
Created attachment 465441 [details] Test uploading a 23.6MB file
Well for some reason it works now... Yesterday any file I attach results in 413
Thanks for testing and confirming that it works now. Yes, I.d updated a limit set on our ingress controller which overlooked after moving to a new platform.
<rdar://problem/106780307>