Doesnt Open From Google Drive

Purchased the app when I was using iCloud Drive. Ive since moved to Google Drive and now cant open files from there. Its a great looking app, but Ive had to go to a free (and pretty decent) app to read my comics. Would love an update (its been a while) that would fix it for the app I paid for.

SajorX about iComics, v1.3.5