Hi @giaco! Glad to hear you’ve been enjoying Seek. Prior to last week, all of the observations made with Seek were only stored on your device. This allows Seek to work for privacy-conscious folks who don’t want to publicly share their records.
Unfortunately there’s not a way to submit your past Seek observations to iNaturalist from within Seek. If you’re interested to do that, I recommend using the iNaturalist app to upload the photos that were originally taken with Seek (or used for the Seek observations). Note that photos taken within the app will not have geotags, so you’ll need to manually add the locations for those.
Given the scale of observations you mention, it may be easier for you to manage those by uploading them on the iNaturalist website, which has more functionality for bulk uploads. Please don’t hesitate to reach out if you have more questions, either here or to help@inaturalist.org.