Follow the steps below to upload content to your instance:
On the menu bar - Edit (preferences) → Settings → SFTP (click “Add key file”)
Click on your instances .pem file and choose it
A dialogue box appears, asks permission to convert your pem file into ppk format. So, click “Yes”, then save the file in a location (If you already have a ppk file, then you can directly use it)
If the saved key is shown in the list then continue, if not then add the keyfile by clicking on “Add key file”.
On the Quick connect bar, enter the following information
Host - You instance’s public DNS or IP
Port - 22 (or whatever your port number is)
Username - Your instance’s username (i.e. ubuntu for an Ubuntu instance)
Password - Instance’s password
Click on “Quickconnect”. Now, you are good to upload and download files.