Retrofit post form uploads string data and pictures

now the server side of our company needs me to upload string data + pictures through the post form.
I have tried to annotate the parameters with Multipart annotations plus PartMap, but the server cannot receive the image resources, and I have strictly followed various methods in converting the parameters to MultipartBody.Part or RequestBody,. I have checked in my log log that I have successfully sent the form data, but the picture resources are uploaded with a string of garbled codes

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Mar.12,2021

what advanced operation. Even the most basic multiple forms are no longer supported?
how to write the front and back end

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