[SOLVED] Open with can't work well

Just upgraded to iOS 8.1.2 but “Open With” still not working with large files. This is a big problem because I cannot export high quality uncompressed files (i.e. WAV) to another app for further processing, nor can I store them to an external drive such as my WDCloud. One workaround is via the Cubasis WiFi Server, but that means I need to be near a computer - defeats the purpose of going mobile with an iPad. Another way is via upload to Dropbox and then download again, but that is very slow and a waste of Internet data allowance - if there is a WiFi connection to the Internet available in the first place. So at present it has become very difficult to do any pro quality work with anything external to Cubasis. Frustrating, because Open With was working really well before iOS 8.0.2! Any news about resolving this issue would be most welcome - but I fear we are at the mercy of Apple…