Cannot upload files from S3 Development Bucket in Rails App

When running my rails app in development mode from Nitrous.io, I cannot access my development bucket which I set up on AWS S3. The upload button opens my personal computer, from where I don't want to load files. (even when I try to load files from my computer, I get a long error message stating "The request signature we calculated does not match the signature you provided. Check your key and signing method"

I think I don't have AWS S3 configured properly.

Currently, I have one IAM user, which I've assigned to AdministratorAccess. Also, I am using the proper AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY in my application.yml file. In fog.rb I have it read from the enviroment.

I should add too that I currently enrolled in a web development apprenticeship program.