When someone fills out your form from the front-end of your website, their content is saved as a Submission. You can view Submissions in the control panel via Formie → Submissions.
Submissions contain all the content a user has provided when filling out the form. You can also edit the submission in the control panel, should you wish to alter the content.
For mutli-page forms, submissions are saved on every page submission. If the page is not the last page, the submission will be marked as
isIncompleted. This allows you to see the content of incomplete submissions, which can be important for form abandonment. It also provides users of the form a means of saving their submission along the way.
You can view incomplete submissions in the control panel, but filtering the Submissions index.
For submissions that have been classified as spam, the submission will not appear alongside other submissions. Instead, it will be categorized as spam. If you have chosen to opt to save spam submissions to the database (in your Formie Settings), you'll be able to filter submissions by their spam status, on the Submissions index.
An important part in any system that deals with user-provided content is privacy and data retention. Formie provides a handful of settings for you to manage user submissions. Each seetting can be managed per-form (see Forms), where you can opt to retain submission data for a set number of hours, days, weeks, months or years.
If a submission is associated with a user (through the "Collect User" form setting), when that user is deleted, you'll be able to decide how submission data should be handled. You can either transfer it to another user, or delete it permanently.
Similarly with file uploads, you can also choose how your forms handle this when deleting a submission.
Available for Craft 3. Get it from the plugin store.