As I can see the category field is not synced between Memotoo and Evolution and vice versa. If I sync from Memotoo the field is empty. If I fill it in Evolution and sync, on Memotoo the field is empty. After changing the memo and sync back to Evolution the field again is empty, but I have filled in before.
For this to work, Memotoo would have to support syncing memos as vCalendar 1.0 or iCalendar 2.0 (better). Right now, Memotoo only supports plain text memos which don't have a way of exchanging the category.
SyncEvolution itself already supports vCalendar/iCalendar/text and chooses dynamically, so nothing needs to be changed there.
Thank you, I will check with Memotoo.