Thats bad and force me to use another editor like innovastudios editor.
So i can give administrators the right to upload images and documents on one hand (using data bridge file and image upload extension) and users the right to use the assets but not upload, change or delete assets on the other hand.
I like using webassists extensions for nearly 10 years but some are not flexible enough to be useful.
Choosing an image from a given directory is one of the basic functions of an inline html editor.
You should keep this in mind for the next versions of your extensions.