Can I import CSV without a plugin?

Can I import CSV files with Appian without using any sort of plugin?
I know that there are plugins that allow for this, but I'm in an Appian cloud environment and plugins are not always capable/available.

What I need to do is allow the end user to import any one of six different CSV files all with different headers and data.
Based on the data in the files I need to do different calculations.
I have no problems running queries against the data after it's been imported. 

If this is possible without a plugin, can you point me in the direction of documentation/tutorials to help me out with this?

Thanks,
pete