I can't figure out where the data in an IMPORTRANGE function is coming from.
How can I use the spreadsheet key to find the the original spreadsheet IMPORTRANGE is pulling from?
A Google spreadsheet URL looks like the following
1mPqoaJW75FlHI_nCIZ-O9MBaTQ5Y58HGf0bdzFMKd-Y by your own spreadsheet-key.
An alternative is to use
The same apply, just replace the file id by your spreadsheet-key