tf signature internal testing source technical service provider Testflight quotation!!

TF signature is actually also called TF listing, and its full name is testflight. It is actually Apple's official internal testing distribution channel. We all know that the only official channel for iOS users to download APPs is the App Store, but in fact testflight is also an official channel, but Apple's testflight sign is used for internal testing.
If you are interested, please contact TG: @yltaiwan