In a Google spreadsheet integration, how does it select the lines in the spreadsheet where the info will be pushed? If I have one line filled followed by a few blank lines (because I erased the data) followed by filled lines, is there a risk that it overwrites the filled lines ?
The Google Spreadsheet integration should always be appending data to the very end of your spreadsheet. If you have a few blank rows, followed by some filled-in rows, there should be no risk of your filled-in rows being overwritten — the integration should skip over the blank rows in the middle and the filled-in rows underneath, and begin by adding your data on the next completely empty line.
I hope this helps to answer your question!