You can share either with users who also have a CAYA-assigned email address, but also with email addresses that do not yet have a CAYA account. After approval, these users will be invited to set up a free account with which they will have read access to documents.
You have the option to go directly to the document in question in the inbox and share it with people of your choice. To do this, simply click on the share icon. You can find the share icon under the "Share" tab, as shown in the image below. In the input screen that appears next, simply add the email address of the person you want to share the document with. You can then add a short message for the appropriate recipient. You can add email addresses that already have a CAYA account as well as email addresses of people without a CAYA account.