"Save online" fails in Windows, when building with Qt 5.12.4
When building MuseScore using Qt 5.12.4 (or later), "Save online" fails.
Error message (in a MinGW debug build): Warning: QSslSocket::connectToHostEncrypted: TLS initialization failed (:0, )
This is due to the fact that in Qt 5.12.4 the (Open)SSL requirements have been raises to version 1.1.1, for TLS 1.3 support, see https://blog.qt.io/blog/2019/06/17/qt-5-12-4-released-support-openssl-1…
Workaround: copy the DLLs of either attachment (depening on whether you use 32bit of 64bit) into the directory where MuseScore3.exe sits (these DLLs are OpenSSL version 1.1.1c)
The 4 additional needed DLLs need to get added to https://s3.amazonaws.com/utils.musescore.org/dependencies.7z