Tags are maintained internally by RecentX . The files are not touched to set the tags. So if you move them anywhere else, you will not be able to see the tags.
If you purchase a license you can use RecentX on up to 2 computers.
Also, syncing is not easily possible since the listing, will not be accurate then.
Each computer has its own set of configuration, files, etc. So RecentX maintains separate individual databases for each computer. So syncing is not possible.
Currently it is not possible to search files by more than one tag name in RecentX .