You can select 1 content-type at a time to run in staged files. For example, you can't upload files and select an entire database in a skill search. If selecting multiple content-types is attempted, an error message will appear. In this example, selecting files from a computer and selecting files from a database was attempted, resulting in an error message:
You're adding new content to this request. Requests can only use one type of content at a time. Adding a database will replace the 2 file(s) that you've previously selected in this request.
Select
Keep files
or
Add database
to continue.