What kind of this folder type..?
is it like zip file..?
It's strange, but that's how Tableau works. When you connect to a text file (including csv), it sees that text file's folder as a sort of database and lists all the text files in that folder. Fortunately, Tableau will only actually connect to the files that you drag over into the data pane. If you have a lot of files to search through, then use the search button to find the one you're looking for.
This is the default behaviour. Whenever I work with csv, I get all the csv files which are there in that folder. A workaround would be create a separate folder and put required files in that.
Hope that makes sense.
yes,I agree with this workaround