Same issue, plus PDFs that appear to be successfully uploaded to a Custom GPT are gone at the next session. All PDFs have been through OCR with Adobe before I tried to load them into GDP. I tried uploading them through all 3 windows, same effect. I told it to OCR each new PDF when uploading them. I can get the GDP to process all files correctly in the session that way, in the end I can see them all correctly. But once I shut down and come back in, only a random selection of them remains in my knowledge base. All are similar size, produced in the same way, no clear pattern as to which ones remain and which disappear.