Cloud support in F-Stop in rather limited (compared to local images).
Currently cloud images are not being added to All Media, Tags, …. They are only available to be browsed inside “Cloud services” section. So, while you can tag/rate images from NAS/Samba, for other cloud providers this is not possible and will not sync. We do read metadata when we generate previews, but that’s about it. And you can not really force to read metadata fro whole folder, this normally happens when you open the folder. But, it will not read subfolders, only current folder.

We are aware of all these limitations, and do plan to improve it, but currently cloud support is not our top priority. Our todo list is almost endless.