Unable to upload reference book
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I have a book "Chemical Pressure Vessel Design": "Methods, Problems and Key Points" Design Reference Book cannot be uploaded no matter what. The file size is more than 9M. I divided it into 5 compressed packages. When uploading, it always prompts "The source of your request is incorrect or the verification string does not match. It cannot be submitted." If you have installed some kind of personal firewall software that blocks incoming information by default (such as Norton Internet Security), please set it not to block incoming information and try again. ”Hope experts can help solve it. Note: I uploaded some other files just fine, but this book cannot be uploaded.
But it’s impossible to tell from your above analysis, because from your description your conditions have not changed, only the book has.
This happens to me sometimes. Check to see if there is something wrong with your book. You should compress a few more, or the place where you uploaded it is wrong. You need to go to the data sharing area.