I flew my Air 2s recently for the first time in months. I updated its firmware and Smart Controller firmware first.
However, some of the controls related to tracking and and special video modes appear to have changed.
Where can i find a user guide for the latest version of the Fly App?

The last DJI Fly App User Manual that DJI posted was back in 2020 and that page is no longer available.  One of the more current versions of the Fly app is covered in the Mavic 3 User Manual, starting on Page 60.  
https://dl.djicdn.com/downloads/ ... _Manual_v2.0_en.pdf  

You'd think somebody at DJI could take on that task and get an updated one posted.  

Hi. Thank you for your inquiry. I'm sorry to inform you that the DJI Fly app user manual is not available. However, you can still refer to the DJI Air 2S or DJI Smart Controller user manuals at https://dl.djicdn.com/downloads/ ... _Manual_v1.2_EN.pdf and https://dl.djicdn.com/downloads/ ... nual_EN_202109.pdf. Thank you for your support of DJI.

DowntownRDB Posted at 3-18 09:07
The last DJI Fly App User Manual that DJI posted was back in 2020 and that page is no longer available.  One of the more current versions of the Fly app is covered in the Mavic 3 User Manual, starting on Page 60.  
https://dl.djicdn.com/downloads/DJI_Mavic_3/DJI_Mavic_3_User_Manual_v2.0_en.pdf  

Thank you. I'll check it out

ReproRetro Posted at 3-18 16:11
Thank you. I'll check it out

Thank you