How can I get edits done in aCalendar to sync?
aCalendar's help docs ("General Sync Issues / Sync of two devices" and "Problems with Google Calendar Synchronization") list a number of settings to check, including:


background data
energy/battery/power saver


In particular, if the phone's energy saver mode is turned on, background apps are restricted. aCalendar relies on Google Calendar running in the background for synchronization, so energysaver mode thus interferes with calendar synchronization. 

To get calendar sync to work, go into the energy saver settings and exclude/exempt Google Calendar. It should not be necessary to exclude aCalendar or other calendar-related apps (e.g. Calendar Storage).