XD bridge exports, with the .qtbridge extension, cannot currently be imported with the 2.3 beta snapshots. they fail with the following error -
Failed to read the metadata archive.
/Users/brook/qt_ds/snapshots/2.3/bridges/tests/xd/basic/Untitled — 16 November, 12.29.18.qtbridge
No components to write.
Changing extension to .zip and manually unzipping the folder, then importing the metadata works as intended.