2.21.06 Breaking changes

Starting from Server version 1.9.69, new Android device installations are only possible with Android application version 2.21.06.0 or higher

Android v2.21.06

Fixed a bug when the device did not save the assigned license ‍ ## Version 2.21.06.4

Adjusted the external video player playlist ended event sending to the current displayer functionality
Validation of cached files now also checks if the file sizes are consistent with the ones on the server ‍

Fixed a bug where transformed external video players were not removed correctly and stuck on the screen ‍

Reworked the preview creation
Normal mode allows the device to create and upload previews every 5 minutes
Rapid preview mode allows more frequent preview creation for a limited time
Added a function for high-resolution preview upload
Reduced the size of the preview file
Changed the move to server function to work with the new server changes
Android devices now accept an Install rule key if it was sent down with move to server command
Changed the registration process to work with the new server changes

Fixed a bug where devices sometimes uploaded black preview
Fixed a bug where Qbic devices sometimes were not able to continue displaying after daily reboot