Problem
You receive the following error message: Error 0x800700DF: The file size
exceeds the limit allowed and cannot be saved.
Solution
Windows limits the maximum size a file transferred from or to a WebDAV share
may have. You can increase the value FileSizeLimitInBytes in
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
by clicking on Modify.
To increase the limit to the maximum value of 4GB, select Decimal, enter a
value of 4294967295, and reboot Windows or restart the WebClient
service.
Your only option would be to split big files into smaller files. The easiest hassle-free way to do this is using “HJ Split” or similar (http://www.hjsplit.org)
The ownCloud developers (Nextcloud is just a theme for the original client currently) have implemented junking since a very long time for this. Any size file can be synced this way.
My friend you have that function already, as you are just running a themed version of the ownCloud Client. Thats why your issue most likely has nothing to do with this but you will need to fix some config stuff …
Indeed the nextcloud and owncloud win clients seem to be very similar.
My nextcloud server is configured well, so I can up- and download files > 4GB very well with the webclient. But with the winclients (nextcloud and owncloud) the download breaks when reaching 4GB. File chunking is provided by both, but your statement ("…Any filesize can be synced this way…") doesn’ t apply for me.
The win side is x64 and NTFS, so it can handle files >4GB. The problem lies in the cloud-clients.