Welcome back to the community, @etchin! Please be informed that storage differs from submission. A single interview captured in a form is a submission. In contrast, if you have media files (like audio, video, recordings, images, signatures) for that interview, they go up for storage. You can collect 5k monthly submissions and 1 GB of storage for the community plan. However, if you feel like either should exceed, you must upgrade your account to a paid plan.
You should always be able to monitor your submission/storage use as outlined in this announcement:
