The shared spreadsheet — one row per spec, one tab per site, and what not to touch.
Every spec you submit becomes one row in a shared Google spreadsheet. Nothing else is kept anywhere: the spreadsheet is the record.
Below the form’s Submit button is a panel labelled Open the spreadsheet — “Every submission lands here as a row”. It opens the spreadsheet in a new tab. It sits below the form on purpose, out of the way, so you cannot lose a half-typed spec by mis-tapping it.
Whether you can view the spreadsheet depends on your Google account having been given access to it — the form itself can always write to it, but the link only opens for people it has been shared with. If it will not open for you, ask the person who runs it to share it with your Google account.
The spreadsheet is an ordinary Google Sheet and the rows are yours to work with — sort them, colour them, comment on them, delete a test row you made by mistake. Two cautions, though:
If a tab is ever emptied completely — every row including the header — the app recreates the header row by itself on the next submission, so a fresh tab needs no manual set-up.
There is no practice or sandbox version of the form: every submit writes a real row to the real spreadsheet. If you file a test entry, open the spreadsheet and delete that row afterwards.