Hi @staffan,
In general we don’t sync these attributes and most storage providers do not offer a built-in way to sync this type of information.
Custom icons and tags are metadata that is separate from files, so it requires special logic and the storage API needs to either support this information, natively, or provide a method to define arbitrary metadata fields.
There is a feature request for this here: Syncing Extended Attributes on OS X (tags/labels)
We do not have any current plans to add this, but it would be a nice feature to have.