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

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1beb374-311e0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1beb374-311e0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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