How can images uploaded via FTP be captured and accelerated by Qiniu?

I used wordpress to build a website online, because it is collected articles and images are downloaded and saved locally during Collection. after the website is built, place the local website on the Internet; upload images to the website space through FTP; set Qiniu acceleration and find a problem... I used wordpress to build a website online, because it was collected articles and images were downloaded and saved locally during collection;
After the website is built, the local website is placed on the public network; images are also uploaded to the website space through FTP;
One problem found after setting Qiniu acceleration is that the images uploaded by FTP cannot be captured or accelerated by Qiniu;
However, images, css, and js on wordpress themes can all be cached...
I don't know why. I'm so grateful to you for your question.

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I used wordpress to build a website online, because it was collected articles and images were downloaded and saved locally during collection;
After the website is built, the local website is placed on the public network; images are also uploaded to the website space through FTP;
One problem found after setting Qiniu acceleration is that the images uploaded by FTP cannot be captured or accelerated by Qiniu;
However, images, css, and js on wordpress themes can all be cached...
I don't know why. I'm so grateful to you for your question.