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Android's new developer verification rollout begins, sideloading changes are next
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
If you want to get apps you've already downloaded, the only way I know how is by using the Google Files app.
I download all my apps through Obtainium. There may be an easier way than this, but I use all the URLs from the Obtainium export file to go directly to the .apk file. I do this quarterly. I don't use very many apps, so its not a long process, even if it is manual.