Apple TF signature - now commonly used testflight signature quote!

TF signature is Apple's new distribution model TestFlight, which is officially recognized by Apple. A simple understanding of tf on the shelves is the distribution platform developed by Apple for internal testing. Users need to download the TF software first, and then download the corresponding App.
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Tags/keywords: ios on the shelves, tf signature internal testing, Testflight on the shelves, Apple TF signature, TF on the shelves
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