I apologize for necroposting, but seems like this is the most recent topic on Dropbox sync and INITIAL error. Has anyone ever been able to make this work? I"m using ASUS TUF-AX5400 with latest and pre-latest firmwares (3.0.0.4.388_22525-gd35b8fe and TUF-AX5400_combo_3.0.0.4_388_21224-g702a50f)...