Much better support for google drive than pdf expert – PDF Viewer - Annotation Expert Review

I am looking for a simple solution to annotate my pdf files in google drive. When I tried pdf expert, it shows all shared files in the drive root folder, making the file list very messy. This one uses the same api of the files app provided by Apple. The behavior for google drive is exactly when I expect. This reason sounds small, but it completely drive me from pdf expert to this one.
Review by Qiuwch on PDF Viewer - Annotation Expert.