Starting with Triofox version 14.3.1189.54946 and above you can specify a sub-folder from an AWS S3 bucket as the root of a published share using these steps (previously you could only specify the bucket as the published share root):
Step 1. From your management dashboard, go to your published shares.
Step 2. Edit your S3 share.
Step 3. Enter the security credentials on the next screen
Step 4. Here you can enter the virtual path to the sub-folder from your bucket. For example, if you have a bucket with a folder called "folder1" and inside this folder there is a "folder2" that you need to set as the storage root, Please enter "folder1/folder2/" (without quotes).
Step 5. Finish the setup wizard.
Step 6. To verify that it is working, return to the Published Shares page, click on Manage under the S3 published folder.
Step 7. If it worked, you will see the contents of your sub-folder under the Contents tab. If you typed the path incorrectly, edit the share again and fix the path.