Nextcloud version : 126.96.36.199
Client version: Version 2.5.0daily (build 20181112)
Operating system and version: Raspbian 9 (server) MacOS Mojave (client)
Apache or nginx version: Apache 2.4.25
PHP version: 7.0
Client ignore list is as follows:
Sync hidden files = checked
When creating a file ending in a ~ sign, the file is not synchronised (yellow dot in Finder).