Why do I pick files through a Google window instead of pasting a link?
Because RowFold deliberately asked for the narrowest access Google offers: permission to open files you explicitly hand over, rather than permission to see your Drive. That is a meaningfully smaller thing to grant, and the picker is how a file gets handed over. The trade is real — a pasted link to a file you never picked will not open, by design — and it is the right way round for a tool you are about to put your operational data into.
What happens to my formulas?
The values come across as text, not the formulas. That is usually the right outcome, because most spreadsheet formulas exist to fake things a database does properly: a lookup becomes a real link, a running total becomes a rollup that cannot go stale, and an IF chain becomes a formula field every row shares instead of one that was dragged down 400 rows and stopped at 380.
Does the table stay in step with the sheet afterwards?
It can, one way. Importing the spreadsheet again updates the tables it made, and Keep in sync does that hourly or daily. A sheet has no row IDs, so each row is matched by the value in its first column: change that cell and the row arrives as a new record, with the old one left where it was. Nothing writes back to Google, and an edit made here to a column the sheet fills is replaced on the next run, so the cleanest shape is still that the table becomes the original and the sheet stops being maintained.
My header row isn't the first row. Will that work?
The first row is read as the field names, so a sheet with a title banner or a blank line above the headers will produce fields called things like Column B. It is worth a minute in Google first: delete the decoration above the headers, and make sure each column actually has a name.
How big a sheet can it handle?
Up to 10,000 rows and 200 columns per tab. Past either limit the import stops at the cap and tells you so in its warnings, rather than quietly leaving the rest behind. For most operational sheets that is plenty; a tab genuinely larger than that is usually a log that wants splitting by year, or a sign the data should arrive another way, such as the API or a CSV import.
Can I import several tabs and keep them related?
Yes, and that is the part worth doing properly. Bring the tabs across, then add a relation between the tables — Orders to Customers, Line Items to Orders — and the joins your sheet was faking with VLOOKUP become real. Do it once and every later report gets it for free.