Tiller Feeds use reserved column headers to fill data. If you change the name of a feeds column, the feeds process will not know where to insert data and will just skip insertion of that field for new rows. Changing the name back will allow the field to be included for new data, but the records that were already inserted (without the
Account field for example) will have already been marked as inserted and will not be reconciled.
The data is all in the Tiller back end if you create a new Foundation Template and allow it to fill (since the time your account was created). If you really want to backfill the data, you could create a new Foundation Template, link the same accounts, fill all your data into the
Transactions sheet, copy your new
Transactions sheet into your old Tiller spreadsheet, and then use a formula to
VLOOKUP() the account names matching on the
Account Id field. Once you have filled the
Account column, you could copy and paste all the data as values. This is very doable but it will take a little time and expertise.