Thanks, I can reproduce the issue. I'll fix it in an update.

Textastic 6 will support split view multitasking. You can sign up for the beta here: http://goo.gl/forms/piRaSmBzmM

It looks like the OneDrive file provider implementation is buggy. I had similar problems with it before and it was basically unusable. I hope they fix it soon.

Other apps like Working Copy or iCloud Drive work fine.

You can enter arbitrary URLs when you open the preview screen and switch from Local to Remote, so this is necessary.

I could reproduce the error with the ownCloud Demo installation at https://demo.owncloud.org/

I do get the errors you describe in Textastic and I also tried it with Byword. When using Byword, I get the same error messages on the debug console. The only difference is that Byword doesn't present the errors to the user while Textastic does. You can check this for yourself with the "iOS Console" Mac app http://lemonjar.com/iosconsole/

So, this really looks like a bug in the ownCloud file provider extension. I have debugged everything related to saving and can't find a problem in Textastic's code.

Hello, you can already tap and hold a .zip file in Textastic for iPad/iPhone and choose "Open In…" which allows you to use AirDrop to send the file another iOS device or Mac.

That's weird. I'm using Apple's UIDocument class which handles saving automatically and is also responsible for the temporary files names you are seeing. Does a reboot of your iPad fix any of the problems you are seeing? Unfortunately, I have seen many document picker issues go away after a reboot...