Wrong file or lost access
Select the spreadsheet again with the same Google account that owns or can open it.
Do not reconnect random tabs in a live form. Confirm the selected spreadsheet, exact sheet tab, header, usable rows, and respondent preview in that order.
Independent guide: FormSuite Choice Sync is not affiliated with New Visions Cloudlab's Form Ranger.
Select the spreadsheet again with the same Google account that owns or can open it.
A saved mapping can point to a name that no longer exists after a Sheet edit.
Keep one header in row 1 and at least one real value beneath it. Whitespace-only cells do not count.
The final check is the respondent-facing preview, not only the mapping screen or Form editor.
FormSuite Choice Sync separates source access, tab lookup, column lookup, empty-source detection, choice preview, update result, and public-preview confirmation. A failed check reports the recovery stage instead of treating a saved mapping as proof that the form changed.
It also refuses to write when the target question contains section routing, a quiz answer key, or more than 1,000 incoming choices.
This workflow does not provide respondent-time dependent dropdowns, booking, inventory locking, payments, or live filtering. It refreshes owner-controlled choice lists before respondents use the form.