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How to fill in the PDF category of idle fish?
1. List the e-books to be published in detail and make pictures.

2. Then enter the salted fish, click Publish, and click Publish Idle.

3. Select the picture of the book list and upload it.

4. Enter a description, try not to reflect the book, and modify the description.

5. Choose other idle books by classification, and don't choose books, because books need to scan barcodes, and e-books have no barcodes, so choose other idle books.