The forum’s not going to be able to help diagnose a problem with specific documents … you’re better off sending a trouble report to support-at-devontechnologies.com or here and including samples of the PDFs that DEVONthink is not recognizing as convertible. That way the tech staff can see the actual issue and deal with it.
If a PDF has been OCR’d previously, it will show up as “PDT+Text” and no further action is needed. (In fact, converting/OCRing an already-OCRd PDF makes things worse, not better)
Yes, or you can select a group of PDFs and have them all converted in a batch (one-by-one, not simultaneously) I keep a Smart Group defined as follows in my databases so I know at a glance what’s not been converted:
In the Kind column of document displays it says “PDF+Text”. So does Tools > Show Info
Sure. You can delete the original automatically if you go to DEVONthink > Preferences > OCR and select “Original Document: Move to Trash”
See DEVONthink Help for further instructions on the preference settings…