I've been using Stack for a few years and like it a lot. Downside is that it might go to the Google Graveyard someday. Partially mitigated because the app mirro

I've been using Stack for a few years and like it a lot. Downside is that it might go to the Google Graveyard someday. Partially mitigated because the app mirrors PDFs of all my uploads to Google Drive, but not sure how much metadata that includes.