Warning: IOS/ Apple users, updating GliderKeepers, any model, has been reported to work unstably, sometimes it works, sometimes it does not. This is something related to this operating system. If you are experiencing problems, may we suggest you try from another operating system device for this task that, fortunately, is not very frequent: Android or Windows work like a charm. We are working with this issue but it may take ages until we find out the root cause inside this emblematic operating system, sorry for any incoveniences.