Came here because I noticed mobile devices were no longer syncing new episodes to their sync lists (transcoding would complete, but downloads would not initiate). Nuking and reinstalling the mobile apps (Android or iOS) did not correct this issue.
PMS version was 1.18.4.2171 on FreeBSD.
Forcing a PMS downgrade on FreeBSD back to 1.18.3.2129 corrected the issue without need for correction on my remaining mobile devices (on iOS for me at least). So somewhere in the 3.2129->4.2171 there was a regression on this front that broke the ability to start sync downloads. Just my $0.02.
EDIT: The device that alerted me to the problem (an Amazon Fire 2019) is now properly resyncing it’s old collection. So for FreeBSD/FreeNAS users, I recommend rolling back to 1.18.3.2129 to likely restore sync functionality.
