- When possible, fonts are sent to your device when you preview on mobile. However certain font vendors do not allow for the transfer, display, and distribution of their fonts. You are responsible for ensuring that you respect the font license agreement between you and the font vendor.
- While viewing a prototype on mobile, if the required font is not present on your device, you get an alert message. The missing fonts are substituted with available fonts.
- Adobe fonts
Adobe Fonts will auto-activate and display correctly when previewing an XD cloud document in the XD iOS or Android mobile apps.
- Non-Adobe fonts
iOS 13.0 supports installing custom fonts. You can install custom fonts through third-party apps using methods that Apple provides, or by using the Creative Cloud iOS mobile app (iOS 13.1 and later).
For more information, please refer to this article: https://helpx.adobe.com/ca/xd/user-guide.html/ca/xd/help/preview-mobile.ug.html