Hi,
When I am a guest user, even if I use "add attachments" in the chat form, I get stuck at "Uploading attachment..." and cannot attach anything.
I tried granting the public role using create or readACL of sys_attachment, but it was not possible to attach as a guest user.
Thanks.
（※The image is displayed by a logged in user, but I would like to be able to do it as a guest user.）
