"Could not create folder" error when using Umlaute
I installed ownCloud 10 Server on my Raspberry Pi 3 and i am using the data directory on an USB with 32GB. Everything is working fine, but creating folders or uploading files containing Umlaute like “ä”, “ö” or “ü” does not work. Only the error message appears. Locales are configured with de_DE.UTF-8 (also tried en_US.UTF-8). I can create files with Umlaute anywhere just not on the USB.
So i think this is your issue then. ownCloud is only running on Linux-Operating systems so every data storage needs a linux partition like ext3/ext4 and similar.