How to upload image with a url in the path

I have a file which I am need to get from a subdomain eg,
With he upload it is done under the domain eg,
The website is running under the main domain eg.

The domain is locked to only be allowed from a certain IP address, which is why I need to keep this seperate.
However when I add the to the file upload then it fails with an incorrect path.

Is there anyway around this to get it to work?

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