To add one or more tags to multiple Files and/or Folders, select all of the Files and/or Folders you wish to tag and then click on the tag icon located in the right action bar. Click inside the tag box, type a tag and press enter or type a comma (repeat this step to add more tags). When you've typed all of the tags you want to be added to the Files/Folders, click Save to apply the tags.
Watch this video to learn all there is to know about adding tags in Starchive:
Important Note: Folder tags and Collection Tags are not automatically applied to all Files within the Folder or Collection, they are unique to the Folder(s) and/or Collection(s) that you've specifically added them to. To tag Files within a Folder, please navigate to those Files, select the Files you want to tag and use the Batch Tag feature as described above. Batch Tagging Collections is coming soon.