Hello Jose, I guess you are trying to upload the data sources file. if that is the case then refer https://experienceleague.adobe.com/docs/analytics/import/data-sources/getting-started.html?lang=en here you will get the step by step guide.

Hello Prateek, yes, this is very much possible. However, you can download 50K raws at once and if need more than will have to run multiple queries. Hope this will help.