I am getting an error when uploading an image from a local file:

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data

Even after the error the file name appears in the image name section, but when posted no image is actually included. I have seen another similar post to this about a month ago, but OP said issue was fixed (not the case for me on Linux and Firefox). For what it's worth, the issue also appears on Photon (in addition to standard UI).