Today, Microsoft released Windows 10 Mobile build 10581 to Insiders on the Fast ring, and even though it features many improvements in terms of performance and stability, it still has - among other things - a storage management issue that Microsoft community forum moderator Mike Mongeau is discussing in a Q&A session.
If you happen to use an SD card in your phone and have apps configured to save data on it, you won't be able to modify any of those settings if you upgraded to build 10581. Furthermore, the card will show up as a garbled name in Settings-> System-> Storage. Whatever configuration you had before is carried over; you just won’t be able to change it in this build.
It's worth noting that:
- If you do a hard reset on build 10581, the configuration will get restored to the default option (Phone) and you won't be able to change it.
- If you upgrade from a previous build to 10581, your configuration will remain as before, you just won't be able to change it.
- If you had configured your apps to save data to the SD card before you upgraded to 10581, you won't lose any of the apps or the data, as the issue only affects the ability to configure the default save location.