We can create a temporary bucket for you, but if you want full control over it and don't want it to be deleted, you might want to create your own.
This article tells you how to set this up. We've made a tool that will create the bucket for you so it is quite a simple process. The steps are as follows:
1. Sign into AWS
Create an account with Amazon Web Services if you don't already have one and log into it.
2. Create your S3 bucket
Give your Stack a useful name, e.g. "dash-import-yourorgname" and use this name for the "Name" field in the Parameters section as well
Tick the acknowledgement box at the bottom of the page
Click "Create Stack"
Your bucket will now start being created
Wait a few minutes, click refresh, until the panel on the left says "CREATE_COMPLETE":
3. Obtain your access credentials
Click on URL representing the bucket you just created
Scroll down to the panel called "Secret value" and click "Retrieve secret value"
You will then be shown the three pieces of information you need to access your bucket:
Access Key ID
Secret Access key
Copy these into the relevant location in your S3 tool to gain access to the bucket and start uploading files