I Can't 上传 The Specific Number Of Pictures.....

This happens to most people.

1) Sometimes these uploading errors occur because there is something wrong with the 图片 that 你 are tring to add. It may not necessarily be a problem that 你 can directly see. Just an internal error with the image.

2) From my experience, the 更多 图片 你 add at once, the 更多 get lost. When bulk uploading (for screencaps etc), I never 上传 更多 than about 200 at once and usually one 或者 two 图片 get 迷失 in the uploading process. 给 that 你 are uploading 更多 than 600 at once, 更多 图片 get 迷失 in the uploading process.
My 建议 is to not load that many at a time. Divide your uploads up in order to prevent that many 图片 getting lost.