During synchronization on an Android phone, if the attachment download mode is set to “Auto,” only a small number of notes will be synchronized, and more seriously, notebooks and tags will not synchronize at all.
It seems not because of the setting of attachment download mode is set to “Auto”. The problem seems because Joplin not fully sync the data from my laptop Joplin to Joplin Server. Only a few number data sync. I try to upload all data manually. I’ll try later.