FolderSync does the job, that’s right.
But Folder Sync does not read the catalogue-files from Owncloud and Nextcloud.
So, the FolderSync App always parses the whole directory-structure to find changes.
I am using Folder Sync Pro.
I have a structure like this (SD-Card NOT formated as internal storage):
Content: About 9.000 files with about 70GB data.
I upload a new picture to the server and at least 1 or 2 hours later (after 1/4 of my battery consumption is gone) Folder Sync fails due to the amount of data.
So, forget Folder Sync.
Till last week I used Owncloud since 6 years.
But I got annoyed about the missing feature of 2-way-folder-sync like on the desktop-app.
Then a colleague told me he uses nextcloud and they have the feature.
And indeed, there was written (Mobile Sync App):
The apps allow you to access, sync and upload your data and feature instant upload for fotos and videos, upload management and more features.
But you have to create a home-folder where you can download server-folders…no possibility of specific folder-pairs like on the desktop-clients. No difference to Owncloud.
I think there will never be such an important possibility like folder-pair-based 2-way-sync with the native nextcloud or owncloud-client.
I wonder what may be the problem to say: Hey, Nexcloud app, here is my local folder “storage/3452-335/dcim”, please sync it the the server-folder “smartphone1/dcim”.
Perhaps some developer can explain that, please?
By the way…
After one week of migrating from Owncloud to Nextcloud I came to the conclusion that is was not worth the effort