If you have ever uploaded an offline conversion CSV to Google Ads, seen "successful" in the upload status, and then watched your conversion columns stay at zero, this one is for you.
On paper, CSV uploads and API uploads send Google the same ingredients. A GCLID, a conversion name, a timestamp, maybe a value. Yet the big CRM backfill keeps failing while your live API integration hums along without drama.
In the video below I walk through what is actually going on.
We look at the usual failure points for CSV backfills, like GCLIDs that aged past the 90‑day limit, timestamps that land in the wrong timezone so conversions appear to happen before the click, and conversion actions that were not fully set up when the data was exported. The upload tool will still say "99% successful," even when those rows never turn into visible conversions.
Then we compare that to a live API feed, where conversions go in close to real time, under a single, well configured conversion action. That difference is what gives Smart Bidding a clean signal instead of noisy or missing data.
I also talk through when a quick CSV import is perfectly fine, and when you are better off skipping the heroic backfill project and putting your energy into a reliable, forward‑looking pipeline that sends Google the right conversions automatically.