We’ve heard from a few customers on Android devices who have experienced issues sending invoices as attachments via their Gmail app. We are currently investigating this, and apologize for the inconvenience as we work to resolve the issue.
Please Note: As a workaround, download the latest version (Android v10.25), and your emails will contain a link to your invoice, where your customers can download and pay.
Our team will be reporting back once we know more. Thank you for your patience.