Hi Aaron,
Thanks for reaching out. I am very sorry for the delay.
The mobile app is no longer supported, so it has been removed from the app stores. However you may still use it if you have it installed on your mobile device. The client review experience is mobile friendly - one can watch media, make notes, annotate frames etc., just like on a desktop. In short, you can not track project progress etc. in a mobile-friendly version at this point in time.
Please let support (at) ftrack (dot) com know if you have any tech. questions.
Have a nice day, stay safe!
Best regards from Madrid,
Dan