Open the document you want to share. It can be a PDF document, or it can be something like an image document that iOS can convert to a PDF. (The easiest way to find this out is to follow these steps.) If a Share button is shown (it’s usually in the top-right of the view), tap it. If it is not shown, you can’t share the document, but if you can share it, the Sharing view appears. Look for an option to share with iBooks. If there isn’t one, you can’t share it. But if you can, the document will be added to iBooks as a PDF. Tap to open a PDF file you want to add to iBooks. It might be a PDF file on your iCloud Drive, or it might be one saved by one of your apps. It doesn’t matter where it came from. If someone sends you a PDF in email (or you send it to yourself), you can just tap the PDF in Mail to add it to your iBooks library
It might be a picture file with metadata you can modify, or it might not. That depends on the file. If it comes from the iCloud Drive, you’ll get the best results by searching, and clicking on the file to show the details. If it's an image file or a document with a PDF or JPEG logo on it, the only way to edit the metadata is to open it in Preview. You’ll find the Preview menu from the top-right corner of the image. You also can’t edit the title, or description, or the copyright. Furthermore, you can add it to iBooks by: Searching the document. Clicking on the word you want, then hitting Return. Drag-and-drop the PDF file into iBooks from your computer. But a PDF document is just information! If you can’t add a PDF file to iBooks, you can’t use its features anyway—it doesn’t open, it doesn’t play, etc. For a detailed.