@Roland, I know that this post is about two weeks old now and I'm not getting the exact same issue. I'm using Pcloud's WebDAV implementation and have both an iPhone and Galaxy phone. The Galaxy syncs and keeps up to date with my Linux desktop fine with no issues so far. My iPhone randomly gets way out of sync with the other devices and doesn't update placement of various files correctly.
I'm testing out a budgeting system I made here, and this issue would be a major problem for keeping my budget up to date. I luckily have a solid app that I've been using frequently, but still. 