On several occasions I have down loaded the charts in the AIP. When planning the trip they are in the memory. After shutting down the iPad and restarting for the trip the AIP charts have disappeared. Have I some incorrect settings?

I am running SD under a Samsung 8.4 Tablet Pro (SM-T320) under Aandroid 4.4.2. 
If I download French plates for example, they remain available even I close the WIFI. But they disappear as soon as I stop SD and start it again.
I have read somewhere that this is a behavior imposed by Apple under IOS because they request the developers to flush automatically at the moment an application quits.

If this is correct, why should Android users be submitted to this kind of restrictions ?

Indeed I would prefer by far to have the downloaded plates remaining available when off-line at at any moment, even at power-on or when restarting the application. I don't want to be subject, in any circumstances, to be on-line to get or reactivate the plates.

I hope that what said here above is not correct and that I have missed something

Thanks for the attention and to provide with further instructions on how to achieve what I want.
 

Hi,

How do you download them? By using the "download AIP/product" menu? By using the "search plate" menu? By creating a route?
In the first case, all plates are downloaded and remain available, even when offline.
In the other cases, it's a one by one download and plates are not cached/available offline.

So, if you want plates to be available offline, you need to download them all from time to time, using the map/tools/download menu.

M