Hey @davidpairkit and @meredith.johnson, so .CSV currently isn’t a list of supported types for the file upload control but i filed a feature request with the product team to have them add that in.
As a workaround, you can convert your .csv files to .xslx and upload your files that way. Additionally, if you’d like to work with your .csv data within the context of your app, you can convert your .csv to .txt files and then take the downloadUrl that gets generated and make an HTTP request against the downloadUrl which would pull down the data that came from the .txt file. You can then use some airscript to transform the csv data from the HTTP request to JSON. Check out the post below on how to do that.