There are several reasons, which may be the format of the picture, the bad network, or the wrong location.

It's just that the permission to upload files is not enough, and there is no permission to upload files. When uploading files, the network fluctuates, which causes the interruption of data transmission and leads to the failure of uploading. Upload files. Too large exceeds the allowed upload size. You are not authorized to upload the directory for uploading files. If the uploaded directory is wrong, you need to re-select the directory to upload.