I responded on your other post, but just to be sure you see it, I'm pasting my response here too:
The team has discovered that this is a bug in the current version of the app. Images saved to the camera roll are half the size they used to be. The team knows about it and is working on fixing it. In the meantime, the only way around it is to Send to CC Files as PDF and then export the image from the PDF.
I know that's a pain but the team should have an update soon.
About the transparent background: You'll notice in the new version of Draw that there's a Background Layer in every new drawing. It's possible now to control whether the background is copied or not by hiding its visibility when copying/saving images. To do that, double tap on the layer icon to change its transparency; if the transparency checkerboard is visible on the canvas, the image will export with a transparent background.
Let me know if you still have questions.
Ahhhh great! Thought I was going mad there for a minute. Thanod so much! Just tried the PDF and it's working!
Good. Glad it's working. We'll have a bug fix out probably sometime next week.
Hang in there.