We are working on adding the ability to share more of the content out of the mobile app. For now, what you can do is access the web based app and share the PDF from there.
Here's How:
Open Centriq Online here: https://app.mycentriq.com/.
Log in using your existing account email and password from any device or computer.Navigate to the PDF that you want to share and open it.
Use the share features that are on your phone (or copy and paste the link from your computer) and share it that way.
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Please contact us at support@centriqhome.com if you need more guidance, have questions, would like to submit a feature request or if you have other feedback.