Cache uploads when no network is available and upload once connected

[eikek]

This should be optional, so that users are not required to grant any permission.

[TheOneValen]

You would probably have to allow file access. But I am not sure, as the app should cache it in its own scope.

I Would go about this for every send, every send should be like this for the sake of less complexity:

• Cache file to send and add it to a queue
• A queue Worker tries to upload it and and dequeues it on success
• no Success -> no dequeue and retry with interval, increasing delay and stuff like that

[eikek]

Yes good idea, I also thought about it in a similar way. I thought about different queue impls to avoid requiring another permission. But I haven't really thought about it yet :-). To me this is not a high prio right now, because I don't currently need it.