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How to upload a picture cropped from another tool int the browser side to the server-side?

How to upload a picture cropped from another tool int the browser side to the server-side?

Dear: I have an unigui project. In the client side(the google browser),I have another chat tool, the chat tool can cut some screen area as a picture to the clipboard, and I want to upload the picture in the clipboard to the unigui server side, that is say:How to upload the browser-side clipboard picture to the server side? How to do that? thank you.  
Dear: I have an unigui project. In the client side(the google browser),I have another chat tool, the chat tool can cut some screen area as a picture to the clipboard, and I want to upload the picture in the clipboard to the unigui server side, that is say:How to upload the browser-side clipboard picture to the server side? How to do that? thank you.