open fun rxCopy(from: String, to: String): Single<Void>
Copy a file from the path from to path to, asynchronously.
The copy will fail if the destination already exists.
Return
open fun rxCopy(from: String, to: String, options: CopyOptions): Single<Void>
Copy a file from the path from to path to, asynchronously.
options - options describing how the file should be copied
Return