The photo upload icon is not appearing for some users on Internet Explorer. We're investigating the issue and will update this post as soon as we have more information.
In the meantime, you can workaround this issue by using a different browser (such as Chrome or Firefox) or temporarily switching to the Edit HTML mode of the compose editor.
Update, 1/22: This is now fixed, thanks for your patience.
In the meantime, you can workaround this issue by using a different browser (such as Chrome or Firefox) or temporarily switching to the Edit HTML mode of the compose editor.
Update, 1/22: This is now fixed, thanks for your patience.