The external SD card is recognized. I have been using this rom for a week I think it is the best performing of all the roms with android 11. I hope the Arrow team continues in development.
I don't know what to tell you, I am currently using the SD for updates, storage and so on. Did you mount the sd? Also try to change the sd with one of a different manufacturer. In the storage space menu both the internal memory and the external memory on SD are encountered. There are two items "Internal shared memory" and Portable memory ". In the portable memory item I can see and mount or unmount my SD SanDisk vfat. Regards.
Yes, I eventually installed the full nikgapps package and uninstall some system apps such as the built in calendar and everything works flawlessly thx.Try nikgapps for android 11
Edit: Core version only (Android R) after that install all required apps from playstore.
It is in AOSP source. Here is an official debut explanation of it：