I face the same concern. This is the result of Google changing android to preclude writing to the sdcard as of version 4.4.2 (kitkat). The Coolpad Arise uses kitkat 4.4.2 which absolutely will not allow writing to the sdcard. Period. Later versions of kitkat, e.g. 4.4.4, will allow "some" apps to be moved to the sdcard with the right software from Google Playstore. But even then, those apps must be specifically written to follow special rules with respect to such sdcard use. Nor will any version of android after 4.4.2 allow you to simply store files on an sdcard. Personally, I believe this is an attempt by Google to force users to use Google Drive to store their files rather than their own sdcard storage; though Google claims it is a "security" change to prevent Apps from willy nilly accessing data you have stored on the sdcard. I don't believe it though, because Google could have implemented this same security mechanism (denying sdcard access) at the "app" level rather than at the "sdcard" level - but they chose not to.
The immediate affect of this is that the Coolpad Arise really doesn't have enough room a lot of a apps. They should have more memory in the phone, or upgrade to kitkat 4.4.4 so users can at least move properly written apps to the sdcard.